OTTU or Ottu may refer to:
Ottu, Haryana, a village in Haryana state of India Ottu barrage, a weir on the Ghaggar-Hakra River in Haryana, India Ottu (instrument), a drone-oboe played in Southern India Ottu (company), a B2B SaaS fintech company based in Kuwait Sampson Ottu Darkoh, a member of parliament in Ghana Organisation of Tanzania Trade Unions OTTU Jazz Band, Tanzania A variety of mango Ottu, a Malayalam film