Kosmos 154 (Russian: Космос 154 meaning Cosmos 154), also known as Zond No.3P, was a Soviet test spacecraft launched from the Baikonur aboard a Proton-K rocket.

The test ran from the Zond program from 1967-1970, which produced multiple failures in the 7K-L1's re-entry systems.

[4] Kosmos 154 was launched using a Proton-K carrier rocket, which flew from Site 81/23 at Baikonur.

Kosmos 154 was operated in an Earth orbit, it had a perigee of 183 kilometres (114 mi), an apogee of 223 kilometres (139 mi), an inclination of 51.6° and an orbital period of 88.5 minutes.

Kosmos 154 burned up two days later when orbit decayed, on 10 April 1967.