Oleg Grigoryevich Makarov (Russian: Олег Григорьевич Макаров; 6 January 1933 – 28 May 2003) was a Soviet cosmonaut.

He graduated from Bauman Moscow Higher Technical School in 1957 and started working at the Special Design Bureau Number One (which is now RSC Energia) as an engineer, working on the Vostok spacecraft.

He was originally part of the Soviet lunar program and was training with Alexei Leonov for the first human circumlunar flight.

His second flight was the abortive Soyuz 18a that made an emergency landing in the Altay Mountains, 21 minutes after launch.

After his final spaceflight he continued to work for Energia, both in the Mir space station program as well as the Energia-Buran development.