Newlin is a surname, and may refer to:
- Brett Newlin, American rower
- Dika Newlin, American musician
- Jacquiline Alice Newlin, or 'Alice Day', actress
- Kristen Newlin, Turkish-American basketball player
- Marceline Newlin, younger sister of Alice
- Maury Newlin, Major League Baseball player
- Melvin E. Newlin (1948-1967), Medal of Honor recipient
- Mike Newlin, American basketball player
- Sarah Newlin, fictional character in True Blood
- Steve Newlin, fictional character in True Blood