- David Paul Olsen is Eric Christian Olsen's older brother and stunt double on CBS's NCIS: Los Angeles (2009).
- Became a father for the first time with his fiancée, Daniela Ruah, co-star of his younger brother, Eric Christian Olsen, on NCIS: Los Angeles (2009).
- He is entirely of Norwegian descent.
- Father of one son River Isaac Ruah Olsen (b. December 30, 2013), and one daughter Sierra Esther Ruah Olsen (b. September 4, 2016), from his marriage to Daniela Ruah.
- (June 19, 2014) Married his girlfriend of 4 years and mother of his 5-month-old son, River Isaac, Daniela Ruah.
- Son of Dr. Paul Olsen and Jeanne D. Olsen.
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