David Yost is an American actor and producer. He is best known for portraying Billy Cranston in Mighty Morphin Power Rangers, Mighty Morphin Power Rangers: The Movie, Mighty Morphin Alien Rangers, Power Rangers Zeo, Mighty Morphin Power Rangers: Once & Always and Power Rangers Cosmic Fury.

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In May 2018, shortly after Hasbro acquired the Power Rangers franchise, Yost expressed his desire to help produce a Mighty Morphin Power Rangers reunion film for Netflix. In September 2022, it was announced that Yost was returning to the Power Rangers franchise for a 30th-anniversary special, accompanied by original Black Ranger actor Walter Emanuel Jones as well as former co-stars Steve Cardenas, Johnny Yong Bosch, Karan Ashley, and Catherine Sutherland. The special titled Mighty Morphin Power Rangers: Once & Always was released on April 19, 2023.