The Parent Trap is a 1961 American romantic comedy film written and directed by David Swift. It stars Hayley Mills as a pair of teenage twins plotting to reunite their divorced parents by switching places with each other. Maureen O'Hara and Brian Keith play the parents. Although the plot is very close to that of the 1945 film Twice Blessed, The Parent Trap is based on the 1949 German children's novel Das doppelte Lottchen by Erich Kästner.

Hayley Catherine Rose Vivien Mills is a British actress. The daughter of Sir John Mills and Mary Hayley Bell and younger sister of actress Juliet Mills, she began her acting career as a child and was hailed as a promising newcomer, winning the BAFTA Award for Most Promising Newcomer for her performance in the British crime drama film Tiger Bay (1959), the Academy Juvenile Award for Disney's Pollyanna (1960) and Golden Globe Award for New Star of the Year – Actress in 1961.