Red Top, Red-top or Redtop may refer to
- Agrostis gigantea - known as "Black Bent" or "redtop grass"
- Brewster Red Tops, previous name of the Brewster Whitecaps
- Red tops, a collective term for some United Kingdom tabloid newspapers
- Hawker Siddeley Red Top, an air-to-air missile
- Red top tubes, used to collect samples of blood serum
- Red Top (Dallas County), Missouri, United States
- Red Top (Webster County), Missouri, United States
- Red Top Mountain State Park in Georgia, United States
- Redtop Mountain, Canada
- Harvard's training facility for the Harvard–Yale Regatta
- Redtop (Belmont, Massachusetts), William Dean Howells' house
- Red Top Young, Robert Young, a musician
- Red top milk - in the UK, skimmed milk with a fat content of between 0.1 and 0.3%
- "Red tops" - in the UK, tabloid newspapers such as The Sun, the Daily Star, the Daily Mirror, and the Daily Record known for their red mastheads
- "Red Top", a song recorded by Don Patterson on the album Four Dimensions
- C20LET - a 2.0L Turbo engine produced by Vauxhall/Opel in the 1990s, named after the red valve cover