Blach is a surname, from Old High German translating to the English word "black". It can also be a typo or misspelling of "black". It can also be a Polish surname Błach. Notable people with the name include:
- Arne Blach (1900–1977), Danish field hockey player
- Ejvind Blach (1895–1972), Danish field hockey player
- Helena Blach Lavrsen (born 1963), Danish curler and Olympic medalist
- Niels Blach (1893–1979), Danish field hockey player
- Ty Blach (born 1990), American baseball pitcher
- Wiesław Błach, Polish judoka
See also
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