OTL

OTL may stand for:
 * Oradea Transport Local
 * Over-the-line, a variant of softball played mostly in Southern California
 * Over time limit
 * Output transformerless, a vacuum tube amplifier topology
 * Outside the Lines, an American sports television series focusing on off-the-field stories
 * Oracle Template Library
 * An emoticon representing a kneeling or bowing person
 * Overtime loss in ice hockey
 * Otl Aicher, a graphic designer and typographer
 * South Airlines, by ICAO airline code
 * Ottawa Tool Library
 * On the Loose, an outing club for the Claremont Colleges in Claremont, California, United States