|Mouth||East Siberian Sea|
|Avg. discharge||1,810 m3/s|
|Basin area||360,400 km²|
The Indigirka River (Russian: Индиги́рка; Sakha: Индигиир) is a river in the Sakha Republic in Russia between the Yana River and the Kolyma River. It is 1,726 kilometres (1,072 mi) in length. The area of its basin is 360,000 km². The river flows into the Kolyma Bay, East Siberian Sea. It freezes up in October and stays under the ice until May–June.
The main tributaries are the:
- Kuydusun River
- Kyuente River
- Elgi River
- Nera River,
- Moma River
- Badyarikha River
- Selennyakh River
Ports, settlements and economy 
Main ports on the river are:
In 1638 Ivan Rebrov reached the Indigirka. In 1636-42 Elisei Buza pioneered the overland route to the Indigirka river system. At about the same time, Poznik Ivanov ascended a tributary of the lower Lena, crossed the Verkhoyansk Range to the upper Yana and then crossed the Chersky Range to the Indigirka. In 1642 Mikhail Stadukhin reached the Indigirka overland from the Lena.
Zashiversk on the Indigirka was an important colonial outpost during the early days of Russian colonization. It was subsequently abandoned in the 19th century. Other historical settlements, now long abandoned, were Podshiversk and Uyandinskoye Zimov'ye.
In 1892-1894 Baron Eduard Von Toll carried out geological surveys in the basin of the Indigirka (among other Far-eastern Siberian rivers) on behalf of the Russian Academy of Sciences. During one year and two days the expedition covered 25,000 km, of which 4,200 km were up rivers, carrying out geodesic surveys en route.
The isolated village of Russkoye Ustye, near the mouths of the Indigirka, is known for the unique traditional culture of the Russian settlers whose ancestors came there several centuries ago.
Shipping of the Indigirka 
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Mouths of the Indigirka 
The Indigirka forms a large delta, consisting of a number of streams (each one being labeled on Russian maps as a protoka (river arm)) and islands. About 100 km before reaching the East Siberian Sea ( ), the river splits into two major northeast-flowing streams. The left (westernmost) arm is known as the Russko-Ustyinskaya Protoka; the right arm, the Srednyaya Protoka (Russian for the "Middle Arm"). Further downstream, the third major arm, the Kolymskaya Protoka splits off the Srednyaya Protoka as its right (eastern) distributary, thus justifying the "middle" moniker for the Srednyaya Protoka.
While Srednyaya Protoka means the "Middle Arm", the names of the main western and eastern arms indicate their relative location as well. The Kolymskaya Protoka, or Kolymskoye Ustye is the arm one located on the eastern side, i.e. the "Kolyma side" of the delta (the arm closest to the Kolyma, the eastern neighbor of the Indigirka). The Russko-Ustyinskaya Protoka, apparently known earlier as simply Russkoye Ustye  is the arm one located on the western side, i.e. the "Russian side" of the delta (meaning, the side closest to the (European) Russia). These days the name of the Russko-Ustyinskaya Protoka appears as if it were formed from the name of the old Russian village Russkoye Ustye situated there, but originally the opposite is likely to have been the case, the village being named after the river arm (the Russkoye Ustye) on which it was located.
Several flat islands are formed by the channels of the delta. Listed from the east to the west, the major ones are:
- Usun-Ary lies longitudinally along the coast east of the Srednyaya mouth. It is 12 km long and 2.7 km wide.
- Uparovskiy Island lies completely detached 11 km offshore from the Srednyaya mouth. It is about 2 km long and 1 km wide.
- Ploskiy Island is the farthest offshore of a cluster of islands at the Srednyaya mouth. It is C-shaped and about 3 km long.
- Bolshoy Fedorovskiy lies between the two mouths of the Indigirka. It is 6 km long and has a maximum width of 4 km.
- Vkodnoy and Oleniy islands lie right at the Prot. Russko Ust'inskaya mouth . Both are of similar size, about 4 km in length.
- Krestovyy Island Lopatka Peninsula, 10 km offshore to the NW of the main Indigirka mouths. It is 6 km long and 1.6 km wide. lies quiet isolated directly to the south of the
- Indigirka at GEOnet Names Server
- Location of islands
- William Barr, Baron Eduard Von Toll's Last Expedition. Arctic, Sept 1980.