Cash was stolen from a charity drop-in centre in Kettering during a break-in on Friday morning (December 19).
An offender smashed a window at the Age UK centre in School Lane at about 7am to gain access to the property, which was then searched and cash stolen.
A white man dressed in dark clothing, aged about 35, 5ft 6in and of thin build was seen acting suspiciously near the scene at the time of the incident.
He had a shaved head and was pale, with a gaunt appearance.
Police would like to speak to anyone who may have witnessed this incident or have any information regarding it.
Witnesses or anyone with information is asked to contact police on 101 or Crimestoppers anonymously on 0800 111 555.