PC Ben Nuttall is appealing for witnesses to an assault in Mablethorpe in the early hours of May 1.
The incident happened between 3.20am and 5am on Thursday morning in George Street.
The victim, a 47 year-old man from Sutton On Sea, was approached by three white males aged in their 20s, who kicked and punched him in a unprovoked attack. The victim received medical treatment for grazing and an injured hand.
One of the offenders was wearing a navy blue hoody or Henley jacket at the time.
Anyone with information should contact PC Nuttall by dialling 101 and quote incident number 383 of May 1.
Report crimes anonymously by contacting Crimestoppers on 0800 555 111.