Hilario Grajeda (born September 2nd, 1967) is an American soccer referee.

His first match in MLS was a game between Dallas Burn and Kansas City Wizards in July 2004.

[1] On July 31, 2013, he was the first referee to try out the "Ref Cam" in a friendly game between A.S. Roma and MLS All-Stars, a head-mounted camera that gives the fans the opportunity to see the game in the referee's point of view.

[2] After 2018, Grajeda transition to primarily performing the role of Video Assistant Referee.

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