Ratigan is a surname. Notable people with the surname include:
William Ratigan (1910–1984), American author
Dylan Ratigan (1972–present), American television show host
The Dylan Ratigan Show, broadcast on MSNBC
Fictional characters
Professor Ratigan, a character from the children's book Basil of Baker Street
Ratigan, a character from the animated film The Great Mouse Detective, based on the book