OTR
# OTR

OTR or Otr may refer to:

## Science and technology

* Off-the-Record Messaging, an instant messaging encryption protocol
* Oxygen transmission rate, of a substance
* × Otaara, a plant genus

## Medicine

* Ocular tilt reaction, a form of skew deviation

## Entertainment

* Old-time radio, a broadcasting era
* Off the Record with Michael Landsberg, a sports talk show

### Music

* Otierre, an Italian hip hop band

## Other uses

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