Birthorpe is a hamlet in the civil parish of Billingborough, in the South Kesteven district of Lincolnshire, England.

[3] Birthorpe is regarded as a shrunken medieval village.

[5][6] There was a substantial manor here well before 1300: the family who owned it took their name from the village.

[7] 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.