Thieves have broken into the Army Cadet Hut on Chapman Street, Market Rasen.
Offenders forced entry into the building sometime between 10.30pm on Thursday, September 19 and 10.30am on Saturday, September 22.
A laptop and cash were taken after thieves thoroughly searched the premises.
Anyone with information is asked to call the police on 101 using incident number 165 of September 22.
Information can also be given anonymously to Crimestoppers on 0800 555 111.