Plaskett may refer to:
- Plaskett (crater), a lunar impact crater
- Plaskett, California
- 2905 Plaskett, an asteroid
- Plaskett's star
People:
- John Stanley Plaskett (1865–1941), Canadian astronomer
- Harry Hemley Plaskett (1893–1980), Canadian astronomer
- Joseph Plaskett (born 1918), Canadian painter
- Elmo Plaskett (1938–1998), Major League Baseball player
- James Plaskett (born 1960), British chess player
- Joel Plaskett (born 1974), Canadian rock musician