Chalk is a type of sedimentary rock, composed predominantly of calcium carbonate.
Chalk may also refer to:
- The Chalk Group, a stratigraphic unit in northwest Europe.
- The Chalk country, a region of Discworld
- Blackboard chalk and sidewalk chalk, a material used for writing and art, usually composed of calcium sulfate or calcium carbonate.
- Chalk (drying agent), magnesium carbonate, used for hands in rock climbing, gymnastics, and weight lifting
- Chalk, Kent, a village in England
- Chalk (TV series), a BBC sitcom written by Steven Moffat
- Chalk (film), a 2006 film by Mike Akel
- Chalk (military), a group of paratroopers or other soldiers that deploy from a single aircraft
- Billiard chalk, a silica and corundum compound applied to the tip of a cue
- French chalk, or talc, magnesium silicate, usually as a powder or in sticks