Progress 26 () was a Soviet uncrewed Progress cargo spacecraft, which was launched in April 1986 to resupply the Mir space station.
Progress 26 launched on 23 April 1986 from the Baikonur Cosmodrome in the Kazakh SSR. It used a Soyuz-U2 rocket.
Progress 26 docked with the aft port of the Mir Core Module on 26 April 1986 at 21:26:06 UTC, and was undocked on 22 June 1986 at 18:25:00 UTC.
It remained in orbit until 23 June 1986, when it was deorbited. The deorbit burn occurred at 18:41:01 UTC.