The London 2012 gold medallist will star as himself in an episode of the CW drama's upcoming fifth season, according to TV Line.
It is believed that Lochte will turn up as a guest at a luxury resort where Naomi (AnnaLynne McCord) and Max (Josh Zuckerman) are also staying.
Lochte has said that he would like a post-Olympics acting career and appeared in a Funny or Die skit also featuring Patrick Stewart and Simon Pegg last week.
The 28-year-old has also spoken of his desire to appear on reality shows The Bachelor and Dancing with the Stars.
90210 which airs on E4 in the UK - will return to The CW on October 8.