About 4,000 litres of diesel has been stolen from a tank on land near the A17 in Long Sutton.
Thieves also stole about 300 litres of diesel from a combine harvester in Hundreds Lane between 10.30pm on June 8 and 7.30am on June 9.
Meanwhile, a tractor was stolen from North Road, Gedney, between 7pm on May 30 and 8am on May 31.
Finally, a set of galvanised farm gates was stolen from a field near Ravens Bank, Holbeach St Johns.
It happened in an area near the Blue Bell Inn pub between 4pm on May 31 and 11am on June 1.
Anyone with information should call 101.