|Mission type||ISS resupply|
|Mission duration||173 days|
|Spacecraft type||Progress-M s/n 361|
|Start of mission|
|Launch date||2 August 2007, 17:33:47 UTC|
|Launch site||Baikonur, Site 1/5|
|End of mission|
|Decay date||22 January 2008, 19:51 UTC|
|Perigee altitude||336 km|
|Apogee altitude||347 km|
|Epoch||2 August 2007|
|Docking with ISS|
|Docking date||5 August 2007, 18:40 UTC|
|Undocking date||22 December 2007, 03:59 UTC|
|Time docked||139 days|
Progress M-61 (Russian: Прогресс М-61), identified by NASA as Progress 26P, was a Progress spacecraft used to resupply the International Space Station. It was a Progress-M 11F615A55 spacecraft, with the serial number 361.
The spacecraft docked with the Pirs module at 18:40 UTC on 5 August 2007. It remained docked for almost 139 days before undocking at 03:59 UTC on 22 December 2007. Following undocking it conducted technological experiments and research as part of the Plazma-Progress programme for a month prior to being deorbited. It was deorbited at 19:06 UTC on 22 January 2008. The spacecraft burned up in the atmosphere over the Pacific Ocean, with any remaining debris landing in the ocean at around 19:51 UTC.
Progress M-61 carried supplies to the International Space Station, including food, water and oxygen for the crew and equipment for conducting scientific research.