Diddie is a nickname. Notable people with the nickname include:
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Diddie Vlasto
Pénélope Julie "Diddie" Vlasto Serpieri (; 8 August 1903 – 2 March 1985) was a female tennis player from France. She won the silver medal at the Paris Olympics in 1924 in women's singles, losing the final to Helen Wills Moody. Vlasto also wo ...
(1903–1985), French tennis player
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Diddie Willson
Osbern Putnam "Diddy" Willson (January 17, 1911 – January 19, 1961) was an American football guard who played three seasons with the Philadelphia Eagles of the National Football League (NFL). He played college football at the University of Penn ...
(1911–1961), American football player
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