|Operator||Institute of Biomedical Problems|
|COSPAR ID||1975-110A |
|Mission duration||19.5 days|
|Launch mass||6,000 kg (13,000 lb)|
|Dry mass||3,100 kg (6,800 lb) |
|Start of mission|
|Launch date||25 November 1975,|
|Launch site||Plesetsk, Site 43/3|
|End of mission|
|Landing date||15 December 1975,|
04:48 UTC 
|Landing site||52°17′N 64°11′E / 52.283°N 64.183°E|
Near Amankaragaj, Kazakhstan, Soviet Union
|Reference system||Geocentric orbit|
|Regime||Low Earth orbit|
|Perigee altitude||226 km (140 mi)|
|Apogee altitude||405 km (252 mi)|
Kosmos 782 (in Russian: Бион 3, Космос 782, or Bion 3) was a Bion satellite. It carried 14 experiments prepared by seven countries in all, with participation from scientists in France, Czechoslovakia, Hungary, Poland, Romania, United States and the Soviet Union.
Launched from Plesetsk Cosmodrome on 25 November 1975, at 14:00:00 UTC. The biosatellite was recovered near Amankaragaj, in Kazakhstan, Soviet Union, on 15 December 1975 after 19.5 days.
It included a centrifuge with revolving and fixed sections in which identical groups of animals, plants, and cells could be compared. The subject animals included white rats and tortoises. The effects of aging on fruit fly livers and plant tissues with grafted cancerous growths were also studied. More than 20 different species were flown on the mission, including 25 unrestrained male Wistar rats, fruit flies (Drosophila melanogaster), carrot tissues, and 1,000 embryos of the fish Fundulus heteroclitus (a small shallow-water minnow). A United States radiation dosimeter experiment was also carried out without using biological materials. This experiment was the only joint U.S./U.S.S.R. study flown on the Kosmos series of biosatellites that was developed by Johnson Space Center (JSC); all others were developed and managed by Ames Research Center (ARC).