Valentin Grigoryevich Mankin (Russian: Валентин Григорьевич Манкин, Ukrainian: Валентин Григорович Манкин; 19 August 1938 – 1 June 2014) was a Soviet/Ukrainian sailor from Kyiv, three times Olympic champion for the USSR team.

At the 1980 Summer Olympics in Moscow at the age of 41 years with Aleksandr Muzychenko, he raced in the Star class.

The contest went down to the final race, but Mankin pulled off the victory and won the Gold Medal.

At the end of the eighties he moved to Livorno, Italy, as technical director and coach of the Italian Sailing Federation, where he trained a top generation of sailors.

As of 2005[update], Valentin Mankin remains the only sailor in Olympic history to win gold medals in three different classes.