Progress M-42 (Russian: Прогресс M-42) was a Russian unmanned Progress cargo spacecraft, which was launched in July 1999 to resupply the Mir space station.

Progress M-42 launched on 16 July 1999 from the Baikonur Cosmodrome in Kazakhstan.

[2][5] Progress M-42 docked with the aft port of the Kvant-1 module of Mir on 18 July 1999 at 17:53:21 UTC, and was undocked on 2 February 2000 at 03:11:52 UTC.

[4][3] It remained in orbit until 2 February 2000, when it was deorbited.

The deorbit burn occurred at 06:10:40 UTC and the mission ended at 06:57:20 UTC.