The Yakovlev Yak-26, OKB designation Yak-123, was a Soviet tactical supersonic bomber aircraft flown at the Tushino air show on 24 June 1956.

The Yak-123-1 prototype was developed from the subsonic Yak-25, and in parallel with the Yak-27 aircraft family, with the main goal of operating at supersonic speed.

An internal weapons bay was added for 1,000 kg (2,200 lb) of bombs, including the nuclear RDS-4 Tatyana.

Although these designs showed potential for a supersonic bomber, they did not feature a radar, limiting their usefulness, and suffered from insufficient stability at high velocities, being prone to aileron reversals.

[1] Although flown at the Tushino air show on 24 June 1956, only ten were produced, and the type did not enter service.