Birthorpe is a hamlet in the civil parish of Billingborough, in the South Kesteven district of Lincolnshire, England. It is situated less than 1 mi west from Billingborough and the B1177 Pointon Road, and 2 mi east from Folkingham. Birthorpe was formerly in the parish of Semperingham, in 1866 Birthorpe became a separate civil parish, on 1 April 1931 the parish was abolished and merged with Billingborough. In 1921 the parish had a population of 46. Birthorpe is regarded as a shrunken medieval village. The Manor House and farm house are listed buildings. There was a substantial manor here well before 1300: the family who owned it took their name from the village. The most notable family member was Roger de Birthorpe (died c.1345), who had a distinguished career as a judge in Ireland, becoming Chief Baron of the Irish Exchequer in 1327. Roger was a somewhat controversial figure, who fled to Ireland after being outlawed for his part in a private war with Sempringham Priory, but eventually received a royal pardon. Birthorpe passed to the Deyncourt family before 1343.