Carl or Karl Ols(s)on or Olsen may refer to:
- Bobo Olson (1928–2002), boxer
- Carl Olson (drag racer), American Top Fuel drag racer
- Carl E. Olson (born 1969), American non-fiction author
- Carl G. Olson (1904-1965), American farmer and politician
- Carl Marcus Olson (1911–2011), credited as the discoverer of the process to make silicon pure
- Karl Olson (1930–2010), baseball player
- Carl Olsson (disambiguation)
- Carl Olsen (cyclist) (1893–1968), Norwegian Olympic cyclist
- Carl B. Olsen (1904–1998), American admiral
- Karl Olsen (1910–1999), Norwegian civil servant