Progress M-31

{{Short description|Russian cargo spacecraft}}

{{Use British English|date=November 2020}}

{{Use dmy dates|date=November 2020}}

{{Infobox spaceflight

| name = Progress M-31

| image = Progress-M drawing.svg

| image_caption = A Progress-M spacecraft

| mission_type = Mir resupply

| COSPAR_ID = 1996-028A

| SATCAT = 23860{{cite web|url=http://planet4589.org/space/log/launchlog.txt|title=Launchlog|work=Jonathan's Space Report|access-date=2 December 2020}}

| spacecraft = Progress (No.231)

| spacecraft_type = Progress-M{{cite web|url=https://space.skyrocket.de/doc_sdat/progress-m.htm|title=Progress-M 1 - 13, 15 - 37, 39 - 67 (11F615A55, 7KTGM)|work=Gunter's Space Page|access-date=2 December 2020}}

| manufacturer = RKK Energia

| launch_date = 5 May 1996, 07:04:18 UTC

| launch_rocket = Soyuz-U

| launch_site = Baikonur, Site 1/5

| docking =

{{Infobox spaceflight/Dock

| docking_target = Mir

| docking_type = dock

| docking_port = Mir Core Module forward{{cite web|url=http://space.kursknet.ru/cosmos/english/cargoes/prm31.sht|title=Cargo spacecraft "Progress M-31"|work=Manned Astronautics figures and facts |archive-url=https://web.archive.org/web/20071009095436/http://space.kursknet.ru/cosmos/english/cargoes/prm31.sht|archive-date=9 October 2007}}

| docking_date = 7 May 1996, 08:54:19 UTC

| undocking_date = 1 August 1996, 16:44:54 UTC

}}

| disposal_type = Deorbited

| decay_date = 1 August 1996, 20:33:03 UTC{{cite web|url=http://www.astronautix.com/m/mir.html|archive-url=https://web.archive.org/web/20160820173204/http://www.astronautix.com/m/mir.html|url-status=dead|archive-date=20 August 2016|title=Mir|work=Astronautix|access-date=2 December 2020}}

| orbit_epoch = 5 May 1996

| orbit_reference = Geocentric

| orbit_regime = Low Earth

| orbit_periapsis = 186 km

| orbit_apoapsis = 227 km

| orbit_inclination = 51.6°

| orbit_period = 88.6 minutes

| apsis = gee

| programme = Progress (spacecraft)

| previous_mission = Progress M-30

| next_mission = Progress M-32

}}

Progress M-31 ({{Langx|ru|Прогресс M-31|italic=yes}}) was a Russian unmanned Progress cargo spacecraft, which was launched in May 1996 to resupply the Mir space station.