Pioneer 0 (also known as Able 1) was a failed United States space probe that was designed to go into orbit around the Moon, carrying a television camera, a micrometeorite detector and a magnetometer.

The spacecraft consisted of a thin cylindrical midsection with a squat truncated cone frustum of 16.5 cm (6 in) high on each side.

Eight small low-thrust solid propellant velocity adjustment rockets were mounted on the end of the upper cone in a ring assembly which could be jettisoned after use.

The spacecraft was to be spin-stabilized at 1.8 revolutions per second, the spin direction approximately perpendicular to the geomagnetic meridian planes of the trajectory.

The original plan was for the spacecraft to travel for 2.6 days to the Moon, at which time a TX-8-6 solid-propellant motor would fire to put it into a 29,000 km (18,000 mi) lunar orbit which was to nominally last for about two weeks.