Primarily an early 14thc. church consisting of W tower, nave with four-bay side aisles, and chancel. The font is Romanesque.

The Domeday Survey records a church here in 1086 in the possession of Gilbert of Ghent, the wealthiest landholder in the county at that time. A priest also appears to be associated with this church for under the entry for (Scott) Willoughby it is mentioned that Guy of Craon had jurisdiction of 1/2 a church there 'and over a priest who belongs to Osbournby.' In 1307 the Ghent lands came into the possession of Henry de Beaumont.

Drum fonts with intersecting arches are not unusual in the county. Those closest in design to the Osbournby font with beading in the arches can be found at West Torrington, St Helen and at nearby Ancaster, St Martin and Ewerby, St Andrew, the later fragment now used as a font base. Those at Fulbeck, St Helen and Coleby, All Saints also have beading in the arches but are of a different type family of drum fonts.