Zahl is a surname. Notable people with the surname include:

Zahl (Norwegian family) Cato Zahl Pedersen (born 1959), a Norwegian skier Erasmus Zahl (1826–1900), a Norwegian tradesman and supporter of Knut Hamsun Geir Zahl (born 1975), a Norwegian musician Harold A. Zahl (1905–1983), an American physicist