|Commune and town|
|• Total||249.34 km2 (96.27 sq mi)|
|Elevation||553 m (1,814 ft)|
|Population (2008 census)|
|• Density||450/km2 (1,200/sq mi)|
|Time zone||CET (UTC+1)|
Bou Saada (Arabic: بو سعادة, bu s‘adah, meaning "place of happiness") is a town and municipality in M'Sila Province, Algeria, situated 245 km south of Algiers. As Arena it was the site of a city and bishopric in Roman Africa, now a Catholic titular see. The municipal population was estimated at 134,000 in 2008.
Bou-Saada has traditionally been an important market place producing and selling jewelry, metalwork, carpets and bousaadi knives. There is also a textile mill in town. Even in modern times, Bou-Saada is an important trading post for nomads. There is also some national tourism during winter. Bou-Saada is well-connected with other urban centres by road. M'Sila is 70 km northeast, Biskra is 175 km east, Bordj Bou Arreridj 130 km northeast and Djelfa 120 km southwest. Bou-Saada has two quarters, the old medina (ksar) within the city walls with arched alleyways, and the French town to the south. Surrounding the town are extensive date groves.
Arena was important enough in the Late Roman province of Mauretania Caesariensis to be one of the many suffragans of its capital Caesarea Mauretaniae's Metropolitan Archbishopric, and like most faded.
The diocese was nominally restored in 1933 as Latin Catholic titular bishopric.
It has had the following incumbents, of the fitting episcopal (lowest) rank :
- Luís António de Almeida (1935.10.04 – 1941.04.19)
- Joseph-Conrad Chaumont (1941.06.28 – 1966.10.08)
- György Zemplén (1969.01.10 – 1973.03.29)
- Roger-Émile Aubry, Redemptorists (C.SS.R.) (1973.06.14 – 2010.02.17)
- Mário Antônio da Silva (2010.06.09 – ...), Auxiliary Bishop of Manaus (Brazil)
- A Bou Saâda local football (soccer) club Amel
- Tixier, J. (1958-1960) Gravures rupestres de Bou Saâda (Algérie)" Bulletin de la Société Royale Belge d'Études Géologiques et Archéologiques 17: pp. 21-27, in French
- Poyto, R. (1976) "Les rupestres de Ben-S'rour, Daïra de Bou-Saâda" Libyca Alger 24: pp. 195-202, in French