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Locative (abbreviated LOC) is a grammatical case which indicates a location. It corresponds vaguely to the English prepositions "in", "on", "at", and "by". The locative case belongs to the general local cases together with the lative and separative case.
The locative case exists in many language groups.
Indo-European languages 
The Proto-Indo-European language had a locative case expressing "place where", an adverbial function. The ending depended on the last vowel of the stem (consonant, a-, o-, i-, u-stems) and the number (singular or plural). Subsequently the locative case tended to merge with other cases: the genitive or dative. Some daughter languages retained it as a distinct case. The locative case is found in:
- modern Balto-Slavic languages (see however prepositional case)
- some classical Indo-European languages, particularly Sanskrit and Old Latin
- uncommon, archaic or literary use in certain modern Indian languages (such as Marathi in which a separate ablative case has however disappeared)
The Latin locative case applies only to the names of cities and small islands and to a few other isolated words. The Romans considered all Mediterranean islands to be small except for Sicily, Sardinia, Corsica, Crete, and Cyprus. Britannia was also considered to be a "large island." There are a few nouns that use the locative instead of a preposition: domus becomes domī (at home), rūs becomes rūrī (in the country), humus becomes humī (on the ground), militia becomes militiae (in military service, in the field), and focus becomes focī (at the hearth; at the center of the community).
For singular first and second declension, the locative is identical to the genitive singular form, and for the singular third declension the locative is identical to the ablative singular form. For plural nouns of all declensions, the locative is also identical to the ablative form. The few fourth and fifth declension place-name words would also use the ablative form for locative case.
In archaic times, the locative singular of third declension nouns was actually interchangeable between ablative and dative forms, but in the Augustan Period the use of the ablative form became fixed. Therefore, both forms "rūrī" and "rūre" may be encountered.
The first declension locative is by far the most common, because so many Roman place names were first declension, such as Roma, Rome and Hibernia, Ireland, etc., and therefore use the Genitive form: Romae, at Rome, and Hiberniae, at Ireland. A few place-names are inherently plural, even though they are a single city, i.e. Athenae, Athens or Cumae, Cuma, etc. These plural names use the Ablative: Athenis, at Athens, and Cumis, at Cumae. There are a number of second declension names that would have locatives as well (Brundisium, Brindisi; Eboracum, York; with locatives Brundisiī, at Brindisi; Eboraci, at York, etc.) It is impossible for the Locative to express being located at multiple locations; plural forms only exist because certain proper names such as Athenae happen to be plural. "He is at home" can be expressed by "is domi est" using the Locative, but "They are at their (individual and separate) homes" cannot be expressed by the Locative.
In Ancient Greek, the locative merged with the Proto-Indo-European dative, so that the Greek dative represents the Proto-Indo-European dative, instrumental, and locative. The dative with the preposition ἐν en "in" and the dative of time (e.g., τῇ τρίτῃ ἡμέρᾳ or tēî trítēi hēmérāi, which means "on the third day") are examples of locative datives.
Germanic languages 
The locative case had merged with the dative in early Germanic times and was no longer distinct in Proto-Germanic or in any of its descendants. The dative did, however, contrast with the accusative case, which was used to indicate motion toward a place (it had an allative meaning). This difference in meaning between dative and accusative is present in all of the old Germanic languages and survives in all Germanic languages that retain a distinction between the two cases.
Slavic languages 
Unusual in other Indo-European branches but common among Slavic languages, the ending depends on whether the word is a noun or an adjective (among other factors).
The Czech language uses the locative case to denote location (v České republice/in the Czech Republic), but as in the Russian language, the locative case may be used after certain prepositions with meanings other than location (o Praze/about Prague, po revoluci/after the revolution). Cases other than the locative may be used to denote location in Czech as well (U Roberta/at Robert's house -genitive, or nad stolem/above the table -instrumental).
See Czech declension for declension patterns for all Czech grammatical cases, including locative.
There are several different locative endings in Polish:
- -ie Used for singular nouns of all genders, e.g. niebo → niebie. In a few cases, the softening indicated by i has led to consonant alternations:
- brat → bracie
- rzeka → rzece
- noga → nodze
- rower → rowerze
- piekło → piekle
For a complete list, see Polish hard and soft consonants.
- -u Used for:
- Some masculine singular nouns, e.g. syn → synu, dom → domu, bok → boku, brzuch → brzuchu, worek → worku*, nastrój → nastroju*, deszcz → deszczu, miś → misiu, koń → koniu, Poznań → Poznaniu, Wrocław → Wrocławiu, Bytom → Bytomiu** [* In a few cases, a vowel change may occur, e.g. ó → o, or a vowel may be dropped. ** Final consonants in Wrocław and Bytom used to be soft, which is still reflected in suffixed forms, hence -i-.]
- All neuter singular nouns ending in -e, e.g. miejsce → miejscu, życie → życiu
- Some neuter singular nouns ending in -o, e.g. mleko → mleku, łóżko → łóżku, ucho → uchu
- -i Used for:
- Feminine nouns ending in -ia, e.g. Kasia ("Katie") → o Kasi ("about Katie"), Austria → w Austrii ("in Austria")
- Feminine nouns ending in -ść, e.g. miłość ("love") → o miłości ("about love")
- -ach Used for plural nouns of all genders, e.g. kobiety ("women") → o kobietach ("about women")
- -ich / -ych Used for plural adjectives of all genders, e.g. małe sklepy ("small shops") → w małych sklepach ("in small shops")
- -im / -ym Used for masculine and neuter singular adjectives, e.g. polski język ("Polish language") → w polskim języku ("in the Polish language")
- -ej Used for feminine singular adjectives, e.g. duża krowa ("big cow") → o dużej krowie ("about a big cow")
In the Russian language, the locative case has largely lost its use as an independent case and become the prepositional case, which is used only after a preposition. The latter is not always used to indicate location, while other cases may also be used to specify location (e.g. the genitive case, as in у окна́ ("by the window"). Statements such as "в библиотеке" v biblioteke ("in the library") or "на Аляске", na Alyaske ("in Alaska"), demonstrate the use of the prepositional case to indicate location. However, this case is also used after the preposition "о" ("about") as in "о студенте", o studente ("about the student").
Nevertheless, approximately 150 masculine nouns retain a distinct form for the locative case, used only after "в" and "на". These forms end in "-у́" or "-ю́": "лежать в снегу́", lezhat v snegu (to lie in the snow), but "думать о снеге", dumat o snege (to think about snow). Other examples are рай, ray (paradise); "в раю́", дым dym (smoke); and "в дыму́", v dymú. As indicated by the accent marks, the stress is always on the last syllable, which is unlike the dative-case forms with the same spelling. A few feminine nouns that end with the soft sign, such as дверь and пыль, also have a locative form that differs from the prepositional in that the stress shifts to the final syllable: "на двери́", na dverí ("on the door"), but "при две́ри", pri dvéri ("by the door"). These distinct forms are sometimes referenced as "second locative" or "new locative", because they developed independently from the true locative case, which existed in the Old Russian.
With some words, such as дом, dom (house), the second locative form is used only in certain idiomatic expressions, while the prepositional is used elsewhere. For example, "на дому́", na domu ("at the house" or "at home") would be used to describe activity that is performed at home, while "на до́ме" ("on the house") would be used to specify the location of the roof.
The Slovak language uses the locative case to denote location (na Slovensku/in Slovakia), but as in the Russian language, the locative case may be used after certain prepositions with meanings other than location (o Bratislave/about Bratislava, po revolúcii/after the revolution). Cases other than the locative may be used to denote location in Slovak as well (U Milana/at Milan's house -genitive, or nad stolom/above the table -instrumental).
There are several different locative endings in Slovak:
- -e Used for singular nouns of all genders (except masculine animate), e.g. stôl → stole, láska → láske, mesto → meste.
- -u Used for:
- Masculine inanimate singular nouns ending in a velar consonant, e.g. hliník → hliníku, mozog → mozgu, bok → boku, vzduch → vzduchu, or a glottal consonant, e.g. hloh → hlohu
- All neuter singular nouns ending in -kV, -chV, -iV, -uV (V being o or um), e.g. jablko → jablku, ucho → uchu, akvárium → akváriu, vakuum → vakuu
- -i Used for:
- Masculine inanimate nouns ending in a soft consonant (c, č, ď, dz, dž, j, ľ, ň, š, ť, ž), e.g. ovládač ("remote") → o ovládači ("about the remote"), tŕň → tŕni
- Feminine nouns ending in a soft consonant or a soft consonant followed by a, e.g. vôňa → o voni, kosť ("bone") → o kosti ("about bone")
- Feminine nouns ending in -ia or -ea, e.g. Mária → Márii, Andrea → Andrei
- Neuter nouns ending in -e or -ie, e.g. srdce → srdci
- -í used for neuter nouns ending in -ie, e.g. vysvedčenie → vysvedčení
- -ovi used for masculine animate nouns, e.g. chlap → chlapovi, hrdina → hrdinovi
- -om used for masculine and neuter singular adjectives: pekný/pekné → peknom
- -ej used for feminine singular adjectives and feminine nouns ending in -á: pekná gazdiná → peknej gazdinej
- -m used for masculine animate nouns following the kuli pattern (being most names in -i, -y etc.), e.g. Harry → Harrym
- -och used for masculine nouns in plural, e.g. malí chlapi → malých chlapoch
- -ách used for plural feminine and neuter nouns, e.g. ženy ("women") → o ženách ("about women"). There are variations:
- -ach used when the preceding vowel is long or a diphthong (ia, ie, iu, ô), e.g. lásky → láskach, dielo → dielach
- -iach used after soft consonants, e.g. schopnosť → schopnostiach, srdce → srdciach
- -ích / -ých Used for plural adjectives of all genders, e.g. malé obchody ("small shops") → v malých obchodoch ("in small shops"), with the variation:
- -ich / -ych when the preceding vowel is long: rýchle autá ("fast cars") → o rýchlych autách ("about fast cars")
See also Slovak declension for declension patterns for all Slovak grammatical cases, including locative.
In the Armenian language non-animate nouns take -ում (-um) for the locative. Animate nouns (referring to persons especially) do not take the locative.
- համալսարանը (hamalsaranə, the university) → համալսարանում (hamalsaranum, in/at the university)
- ճաշարան (chasharan, a restaurant) → ճաշարանում (chasharanum, in/at a restaurant)
Turkic languages 
Some Turkic languages have a locative.
The locative case exists in Turkish, as the suffix generally specified by "-DA". For instance, in Turkish, okul means the school, and okulda means in the school. The morpheme may exist in four different forms, depending on the preceding consonant and vowel. The first phoneme of the locative, "D", changes according to the previous consonant: it is "t" after voiceless consonants, but "d" elsewhere. The vowel changes depending on the phonetic characteristics of the previous vowel: it is "a" after a preceding back vowel, and "e" after a preceding front vowel, congruent with the vowel harmony of the language. This gives four different versions of the morpheme:
- -ta, as in "kitapta", "in the book".
- -te, as in "kentte", "in the city".
- -da, as in "odada", "in the room".
- -de, as in "evde", "in the house".
The locative case exists also in Uzbek. For example, in Uzbek, shakhar means city, and shakharda means in the city, so using -da suffix, the locative case is marked.
Uralic languages 
Some Uralic languages have a locative.
Inari Sami 
In Inari Sami, the locative suffix is -st.
- kyeleest 'in the language'
- kieđast 'in the hand'.
In the Hungarian language, nine such cases exist, yet the name locative case refers to a form (-t/-tt) used only in a few city/town names along with the inessive case or superessive case. It can also be observed in a few local adverbs and postpositions. It is no longer productive.
- Győrött (also Győrben), Pécsett (also Pécsen), Vácott (also Vácon), Kaposvárt and Kaposvárott (also Kaposváron), Vásárhelyt (also Vásárhelyen)
- itt (here), ott (there), imitt, amott (there yonder), alatt (under), fölött (over), között (between/among), mögött (behind) etc.
The town/city name suffixes -ban/-ben are the inessive ones, and the -on/-en/-ön are the superessive ones.
The Estonian language has a set of six locative cases, three interior and three exterior ones. They are formed by adding a suffix to the genitive form of the noun.
The interior locative cases are:
- Illative - majasse 'into a/the house', or the preferred irregular short form, majja
- Inessive - majas 'in a/the house'
- Elative - majast 'from inside a/the house'
The exterior locative cases are:
- Allative - majale '(on)to a/the house'
- Adessive - majal 'on (top of) a/the house' or 'at a/the house'
- Ablative - majalt 'from a/the house'
While all nouns have a regular ending for the six locative cases, many have a preferred irregular short illative form. Instead of adding an sse suffix to the genitive, the short illative is pronounced in an overlong manner, reflecting phonetic gemination and a shift from the second to third phoneme length, without adding an extra syllable.
Estonian, like some Indo-European languages (Latin, Russian, Irish), does not normally use the verb to have to show possession. The adessive case and the verb to be is used instead. For example, I have a house in Estonian would be Mul on maja in which mul is in the adessive case, on is the third singular of to be (is), and maja is in nominative, not accusative. So maja is the subject, on is the verb and mul is the indirect object. This could be translated to English as At me is a house or A house is at me or There is a house at me. For this reason, it has been argued that the Estonian adessive case is really a dative one. Statistically, the majority of the occurrences of the exterior locative cases show possession, not location (also Ta andis mulle maja 'He gave (to) me a house', Ta võttis minult mu maja 'He took from me my house').
Standard Finnish behaves like Estonian. The forms of the six local cases vary slightly from Estonian, with one form being affixed differently:
The interior locative cases are:
- Illative - [taloon] 'into a/the house'; cf. maahan 'into the land', sateeseen 'into the rain'
- Inessive - talossa 'in a/the house'
- Elative - talosta 'from inside a/the house'
The exterior locative cases are:
- Allative - talolle '(on)to a/the house'
- Adessive - talolla 'on (top of) a/the house' or 'at a/the house'
- Ablative - talolta 'from a/the house'
Use of adessive in possession:
- Minulla on talo 'I have a house' (lit. "a house is at me")
Algonquian languages 
Algonquian languages have a locative.
In Cree, the locative suffix is -ihk.
- misâskwatômin (Saskatoon berry) → misâskwatôminihk (at the Saskatoon berry) = "[in] Saskatoon, SK"
- misâskwatôminiskâ- (be many Saskatoon berries) → misâskwatôminiskâhk (at the place of many Saskatoon berries) = "[in] Saskatoon, SK"
- mînis (berry) → mînisihk (at the berry) = "[in] Saskatoon, SK"
In Innu-aimun, the locative suffix is -(i)t.
- shipu (river) → shipit (at the river)
- katshishkutamatsheutshuap (school) → katshishkutamatsheutshuapit (at school)
- nuitsheuakan (my friend) → nuitsheuakanit (at my friend's house)
- nipi (water) → nipit (in the water)
- utenau (town) → utenat (in town)
- Buck, page 172
- The Locative Case
- Everything you always wanted to know about Russian grammar but were afraid to ask, AATSEEL Newsletter, October 2007, pp. 7-8.
- Buck, Carl Darling (1933). Comparative Grammar of Greek and Latin. Chicago, Illinois: The University of Chicago Press.