A rotary tube notching apparatus is provided that is capable of operable attachment to a powered rotational drive device. The apparatus comprises a tube support assembly defining an aperture for receiving a tube and having a clamp for securing the tube against movement in relation to the aperture. A shaft assembly is provided for receiving a cutting tool, and a carriage assembly is rotatably mounted to the shaft assembly. The carriage assembly has at least one fastener for securing the shaft assembly in relation to the aperture. The shaft assembly is selectively repositionable in relation to the aperture in an offset dimension defined by linear displacement from a central axis of the aperture, in a yaw dimension defined by a plane extending along a central axis of the aperture, and in a roll dimension defined by a cross-sectional circumference of a tube received within the aperture.