Chiasm may refer to:
- Chiasm (musical project), an electronic music project by Emileigh Rohn
- Chiasm (anatomy), an X-shaped structure produced by the crossing over of the fibers, with the prefix chiasm- means cross examples include:
- A nerval chiasm, where either two nerves cross in the body midline (e.g. Optic chiasma)
- A crossing of fibres inside a nerve reversing their mapping
- A tendinous chiasm, the spot where two tendons cross. The tendon of the flexor digitorum longus muscle forms two: the crural chiasm (with the tendon of the tibialis posterior muscle) and the plantar chiasm (with the tendon of the flexor hallucis longus muscle).
- Chiasma (genetics), the point where two chromatids are intertwined (interwoven) in a cell
- An instantiation of chiasmus