Otu or OTU may refer to:
Places Otu, Iran, a village in Mazandaran Province, Iran Otu, Siga, Japan Otú Airport, an airport in the village of Otú and serving the town of Remedios, Colombia
People with the name Michael Otu (1925–2006), senior commander in the Ghana Air Force Idara Otu (born 1987), Nigerian sprinter
Other uses Ontario Tech University, a postsecondary institution in Ontario, Canada Operational taxonomic unit, in biology Operational Training Unit (Royal Air Force) Optical channel Transport Unit, a layer of the Optical Transport Network Oxygen toxicity unit, a measure of exposure to a toxic concentration of oxygen in breathing gas.
See also Otu Jeremi, a town in Ughelli South LGA of Delta State, Nigeria Otu barrage, a masonry weir on the Ghaggar-Hakra river in Haryana state of India