Cadman is a surname. Notable people with the surname include:
Alan Cadman (born 1937), Australian politician
Alfred Cadman (1847–1905), New Zealand politician
Bill Cadman (born 1960), American politician from Colorado
Charles Wakefield Cadman (1881–1946), American composer
Christine Cadman (fl.1908), British archer
Chuck Cadman (1948–2005), Canadian politician
Colin Cadman (1916–1971), Scottish botanist
David Cadman, Vancouver city councillor
Deborah Cadman (born 1963), British politician
Dona Cadman (born 1950), Canadian politician
Dorothy A. Cadman (fl. 1908–1927), English painter
Elijah Cadman (1843–1927), English evangelist
F. K. Cadman (fl.1904–1931), British socialist
Helen Cadman (born 1956), English netball player
John Cadman (disambiguation), multiple people
Radclyffe Cadman (1924–2011), South African politician
Robert Cadman (1711–1739), British steeplejack and ropeslider
Royce Cadman (born 1987), English rugby union player
S. Parkes Cadman (1864–1936), American clergyman, newspaper writer
Samuel Cadman (1877–1952), English cricketer
Stacey Cadman (born 1979), British actress and television presenter
William Cadman (1883–1948), English missionary