St Martin's Church is a Grade I listed Anglican church, dedicated to Martin of Tours, in Ancaster, Lincolnshire, England. The church is 6 miles (10 km) north-east from Grantham, below the southern edge of the Lincoln Cliff, and at the side of High Dyke, part of the old Ermine Street Roman road. St Martin's is in the ecclesiastical parish of Ancaster and Wilsford, in the Deanery of Loveden, and the Diocese of Lincoln.