“We must now realize the promise of America by trusting God, unifying our vision and building our future. I am running for president of the United States,” West wrote in a social media post late on Saturday (01:00 GMT Sunday), adding an American flag emoji and the hashtag “#2020VISION”.
It was not immediately clear if West was serious about vying for the presidency four months before the November 3 election, or if he had filed any official paperwork to appear on state election ballots.
The deadline to add independent candidates to the ballot has not yet passed in many states.
West and his equally famous wife, Kim Kardashian West, have visited Trump in the White House.