Caenby is a hamlet and civil parish in the West Lindsey district of Lincolnshire, England.
Caenby Grade II listed Anglican church is dedicated to St Nicholas. A moated manor house, now the Grade II listed Hall Farm House, was a seat of the Tournay family from the days of Edward I to George II. In 1541 Henry VIII slept here while on his Lincolnshire progress. In the 18th century the house was occupied by Lawrence Monck.
In 1945 fields adjacent to Caenby were a military Q decoy site, maintained by RAF Hemswell. Dummy plywood buildings, inflatable rubber aircraft or vehicles, and a ploughed faux runway were set up to simulate an active airfield and draw German bombers away from genuine target airfields.