Ashby cum Fenby is a village and civil parish in North East Lincolnshire, England, 4 miles south-west from Holton le Clay.
In the 2001 census the population was recorded as 248. The village was recorded in the Domesday Book.
Ashby cum Fenby Grade II* listed Anglican church is dedicated to St Peter. The church has an Early English tower, aisle and belfry, a Decorated chancel, and Perpendicular font. Beneath the tower are remaining parts of a 13th century rood screen. In the north aisle are monuments to Sir William Wray (d. 1617) and his wife Frances (d. 1647), and to Susanna Drury, sister of Frances.