OTR

OTR or Otr may refer to:

Arts and entertainment

 * Off the Record with Michael Landsberg, a sports talk show
 * Old-time radio, a broadcasting era
 * Otierre, an Italian hip hop band

Science and technology

 * Ocular tilt reaction, a form of skew deviation involving the anatomy of the inner ear
 * Off-the-Record Messaging, an instant messaging encryption protocol
 * Oxygen transmission rate, of a substance
 * × Otaara, a plant genus

Other uses

 * Occupational Therapist, Registered, Licensed
 * Ótr, a mythical dwarf
 * OTR, IATA code for Coto 47 Airport, in Costa Rica
 * OTR (convenience store), Australian petrol and convenience store chain
 * Over the road, truck drivers without schedule or route
 * Over-the-Rhine, a neighborhood in Cincinnati, Ohio, US