Balchin is a surname. Notable people with the surname include:
Cassandra Balchin (1962–2012), British women's rights activist, daughter of Nigel Elliot Balchin (born 1990), British actor John Balchen (1670–1744), sometimes spelled Balchin, Royal Navy Admiral of the White Nigel Balchin (1908–1970), British novelist and screenwriter, father of Cassandra Robert Balchin, Baron Lingfield (born 1942), British educationalist