Two men stole money from The Saracen’s Head pub on Brook Street after forcing their way into a staff office.
The men were caught on CCTV cameras as they broke into the office at about 10pm on Friday, March 13.
After trying to break into a small safe, they were disturbed by a member of staff.
They then fled, but managed to grab some money as they escaped.
Both men were white. The first was aged between 23 and 27, about 5ft 7in, stocky, with short brown hair. He was wearing a grey tracksuit.
The second man was bald, aged between 25 and 30, about 5ft 9in and slim. He was wearing black clothes.
Witnesses, or anyone who recognises the men from the CCTV images, can call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.