Mahajilo River
Map of Malagasy rivers (Mahajilo flows from the central highlands to the Tsiribihina River).
Location
Country	Madagascar
City	Miandrivazo
Physical characteristics
Source	Sakay River and Kitsamby
Mouth
• location	Tsiribihina River, Menabe
• coordinates	19°41′00″S 45°22′23″E / 19.68333°S 45.37306°E / -19.68333; 45.37306
Length	260 km (160 mi)
Basin size	14,375 km2 (5,550 sq mi)
Discharge
• location	Tsiribihina Riverat Miandrivazo[1]
• average	517 m3/s (18,300 cu ft/s)at Miandrivazo[2]
• minimum	53.2 m3/s (1,880 cu ft/s)
• maximum	1,530 m3/s (54,000 cu ft/s)January
Basin features
River system	Tsiribihina River

Mahajilo is a river in Menabe, western Madagascar. It is formed by the affluents of the Sakay river and Kitsamby river. It flows down from the central highlands, to flow into the Tsiribihina River.

Rafting trips are purposed by several operators on this river from Miandrivazo.