Lilbourne is a village and civil parish in West Northamptonshire in England. It is close to the M1 motorway which runs east of the village, and the A5 road, west of the village which marks the boundary with Warwickshire, slightly to the north is the River Avon which marks the boundary with Leicestershire. At the time of the 2001 census, the parish's population was 254 people, increasing to 273 at the 2011 Census, and further to 305 at the 2021 census.