Christiaan is a Dutch given name and may refer to:
- Christiaan Bakkes, South African writer
- Christiaan Barnard, South African surgeon
- Christiaan Basson, South African golfer
- Christiaan Boers, a Dutch resistance fighter
- Christiaan Cornelissen, a Dutch syndicalist
- Christiaan Eijkman, Dutch physician and pathologist, recipient of the Nobel Prize in Physiology or Medicine
- Christiaan Huygens, Dutch scientist
- Christiaan Kuyvenhoven (born 1985), Dutch pianist.
- Christiaan du Toit, a South African commander
- Christiaan de Wet, a Boer general
- Christiaan De Wilde, a Belgian businessman
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