|Operator||NASA / ARC|
|Mission duration||30 days|
|Launch mass||950 kg (2,090 lb)|
|Start of mission|
|Launch date||14 December 1966, 19:20UTC|
|Rocket||Delta G 471/D43|
|Launch site||Cape Canaveral LC-17A|
|End of mission|
|Landing date||15 February 1967|
|Perigee altitude||295 kilometers (183 mi)|
|Apogee altitude||309 kilometers (192 mi)|
|Epoch||14 December 1966|
Biosatellite 1, also known as Biosat 1 and as Biosatellite A, was a first artificial satellite unmanned U.S. belonging to Biosatellite program for biological research. It was released on December 14, 1966 by a rocket Delta G from Launch Complex 17A of the Cape Canaveral Air Force Station. Biosatellite 1 was the first series Biosatellite satellites. It was released in an initial orbit of 296 kilometres (184 mi) perigee 309 kilometres (192 mi) apogee and 33.5 degrees of orbital inclination, with period 90.5 minutes.
Biosatellite 1 was carrying several specimens for the study of the effects of the space environment on biological processes. The capsule was returning to land separated from the vehicle properly, but its rocket malfunctioned, leaving it stranded in a slowly decaying orbit. It re-entered and disintegrated on February 15, 1967.