The announcement happened following a meeting of the International Olympic Committee in Lima, Peru.
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MORE: A look back at the 1984 Summer Games
It will be the third time Los Angeles hosts the summer Games - first in 1932 and then 1984.
Also on Wednesday, the IOC awarded Paris with the 2024 Games.
MORE: Venue list for 2028 Summer Olympics in Los Angeles
The Olympic cauldron at the Los Angeles Memorial Coliseum was lit overnight.
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Also, dozens of Southern California landmarks were lit up with Olympic colors Tuesday night in anticipation of the official announcement.
LA landmarks light up sky with 2028 Olympic colors