David Judah Simon (born February 9, 1960) is an American author, journalist, screenwriter, and producer best known for his work on The Wire (2002–2008). He worked for The Baltimore Sun City Desk for twelve years (1982–1995), wrote Homicide: A Year on the Killing Streets (1991), and co-wrote The Corner: A Year in the Life of an Inner-City Neighborhood (1997) with Ed Burns.

The former book was the basis for the NBC series Homicide: Life on the Street (1993–1999), on which Simon served as a writer and producer. Simon adapted the latter book into the HBO mini-series The Corner (2000). He is the creator, executive producer, head writer, and showrunner of the HBO television series The Wire (2002–2008).