Steyn is a surname, and may refer to:
- Christo Steyn (born 1961), South African tennis player
- Dale Steyn (born 1983), South African cricketer
- François Steyn (born 1987), South African rugby union player
- Johan Steyn, Baron Steyn (born 1932), South African jurist
- Herman Steyn (born 1951), South African author on Project Management
- Lucas Cornelius Steyn (1903–1976), South African politician
- Mark Steyn (born 1959), Canadian journalist
- Martinus Theunis Steyn (1857–1916), South African lawyer, politician, and statesman
- Morné Steyn (born 1984), South African rugby union player
- Paul Steyn (born 1984), Namibian cricketer
- Pieter Steyn (1706–1772), Dutch politician
- Rudi Steyn (born 1967), South African cricketer
- Vance Backlin Steyn (born 1973), South African Surfer
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