Mother-in-law is a kinship relationship as a result of marriage.
Mother-in-law may also refer to:
"Mother-in-Law" (song), a 1961 song recorded by Ernie K-Doe Mother-in-law (sandwich), a fast food dish of Chicago Mother-in-Law (TV series), a Kenyan comedy-drama series Mother-in-Law Island, in Connecticut, U.S. The Mother-in-Law, a 1734 play by James Miller The Mothers-in-Law, an American TV show premiering in 1967 Mothers-in-law, a 1923 American silent drama film
See also Mother-in-law apartment Mother-in-law language Mother-in-Law Lounge