Linthicum is a surname. Notable people with the surname include:
Dick Linthicum (1908/1909 – 1979), American basketball player
Hezekiah Linthicum Bateman (1812-1875), American actor and manager
John Charles Linthicum (1867-1932), American politician from Maryland
John L. Linthicum (1838–1906), American politician from Maryland
J. F. Linthicum, editor of Occidental and Vanguard
Lotta Linthicum (1870s-1952) American actress
Clayton Linthicum, Canadian guitarist and singer in Saskatchewan psych-folk-roots duo Kacy & Clayton.