Mahavavy River (north)
Mahavavy (north) river system
Location
Country	Madagascar
Region	Diana
Cities	Manambato, Ambilobe
Physical characteristics
Source	at the Maromokotra peak
• location	Tsaratanana Massif, Diana
• elevation	2,300 m (7,500 ft)
Mouth	Indian Ocean
• location	Antsohimbondrona, Diana
• coordinates	13°01′54″S 48°51′38″E / 13.03167°S 48.86056°E / -13.03167; 48.86056
• elevation	0 m (0 ft)
Length	165 km (103 mi)
Basin size	3,300 km2 (1,300 sq mi) to 3,387.1 km2 (1,307.8 sq mi)[1]
Discharge
• location	Near mouth
• average	(Period: 1971–2000)119.9 m3/s (4,230 cu ft/s)[1]
Basin features
Tributaries
• left	Antsiatsia, Ambohipato
• right	Andranopato, Ankombe, Antsiatsia

The Mahavavy or Mahavavy-Nord River is a river of northern Madagascar in the region of Diana. It has its sources at the Maromokotra peak in the Tsaratanana Massif and flows north to the Indian Ocean. The main city along the river is Ambilobe at the National Road 6.

The bridge of this road had collapsed after the passage of cyclone Gamane in March 2024. In May local authorities held 2 jôro (traditional rites) hoping this will repair it^[2] but in June of the same year the road was still closed.

It crosses a fertile plain and the waters are used for the irrigation of 5500 ha, of mostly, cotton plantations. Its delta covers 500 km².^[3]