An offset optic mount can be detachably mounted to an accessory rail of a firearm in a cantilevered fashion with its distal end extending laterally from the firearm. An offset optic mount includes: a base adapted to be mounted to the accessory rail; an optic adapter plate configured so that an optical sight can be attached thereto, the optic adapter plate is offset at an angle relative to the longitudinal axis of the base; and a stem adapted to connect the optic adapter plate to the base, the stem is a reversable piece used to set and change the offset angle of the optic adapter plate relative to the longitudinal axis of the base.