Masu can refer to:
Places Masu, Iran, a village in West Azerbaijan Province, Iran Masu, Nigeria, a town in Sokoto State, Nigeria Masu Bhurgri, union council in the Sindh province of Pakistan The other name of Wanli District, a district in New Taipei, Taiwan
Surname Leonardo Masu (born 1934), Italian Olympics weightlifter Nozomi Masu (born 1980), Japanese voice actress Takeshi Masu (born 1955), Japanese actor
Abbreviations MASU, Medical Assessment Unit in a hospital MaSu, an occasional abbreviation of the musical group Machinae Supremacy
Other Masu (measurement), a traditional wooden or origami box Masu, a plant, Hedysarum alpinum, whose edible root is consumed by the Inuit of Alaska Masu salmon or cherry salmon, a species of salmon or trout of the North-West Pacific region