OTB may refer to: Arts On the Boards, an arts organization in Seattle, Washington Out of the Blue (American band), a jazz ensemble Computing One True Brace, a software coding convention for formatting loops, functions, if statements, and blocks Orfeo toolbox, an open source library for remote sensing image processing OTA Bitmap, an image file specification for mobile phones (*.otb files) Sports and games Off-track betting, sanctioned gambling on horse racing outside a race track Over-the-board, in chess, played on a single physical chessboard (as opposed to correspondence or online chess) Off the ball, in association football, a player's movement when not in possession of the ball Other Off the boat, a slang phrase for newly arrived immigrants Overberg Test Range, or Overberg Toetsbaan, a missile test range in South Africa Overseas Trust Bank, a defunct bank of Hong Kong OTB Group, a holding company for several fashion brands The Old Timer's Bulletin an amateur radio history journal