St. Olave's church, grade II listed, is said to be the smallest church in Lincolnshire and is dedicated to St. Olave (Olav) who was of Norwegian royal blood, the son of King Herald and Queen Aasta. Ruckland is the only church dedicated to him.
The church on this site previously measured 31ft long and 17ft wide but by 1880 it was evident that repairs to the church had become urgently necessary however it was decided that a complete rebuild was the only solution and Mr. William Scorer, architect of Lincoln, was engaged to plan the work.
The old church was completely demolished and the stones re-used to erect the present church on the same foundations. However as the Rector and the Churchwardens had not applied for a faculty to demolish the old church and rebuild, the new church was technically a secular building requiring rededication before it could be used. This was carried out by the Bishop of Lincoln at the time. This was carried out by the Bishop of Lincoln at the time.
There is a stone foliated cross set in the wall of the church which is part of a medieval coffin. The west wall incorporates a large prate wheel window.