Diane Stanley was an American actress who played the role of Stewart in the 1968 film Planet of the Apes. Her only other acting credits are in Bad Girls for the Boys (1966) and Speedway (1968). She went on to have a family of one girl and one boy, and passed away in 1993 from complicated health issues.


  • For a long time within the fan community, it was erroneously believed that actress Natalie Trundy had played the role of Stewart.
  • It was also suggested that Dianne Stanley became the writer and producer Diane Messina Stanley. However, this person adopted the name 'Stanley' only after her marriage, whereas the actress in question was born Dianne Stanley.
  • In the original film the character is only referred to as Lt. Stewart. However, a bonus feature from the Blu-Ray Planet of the Apes Box-Set released in November 2008 ('ANSA Public Service Announcement') gave her the first name Maryann.

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