The 16-foot Isla Skiff was taken sometime between Sunday 30 August and Sunday 20 September from its moorings in Poole Harbour, Hamworthy.
The vessel is green above the water line and pink below with cream interiors and pine seats. The the sails were not onboard when it was stolen from its moorings near Lake Road.
Police Sergeant Katie Harvey, of Hamworthy Safer Neighbourhood Team, said: “I am appealing to anyone who may know the whereabouts of the boat, or who perhaps witnessed any suspicious activity in the area in recent weeks to contact me.
“I would also ask for people to remain vigilant. Please report anything relating to the sale of a boat matching this description on 101. All calls will be treated in strict confidence.”
Witnesses and anyone with any information can call Dorset Police on 101 quoting 55150093170 or Crimestoppers on 0800 555111.
If you’re concerned about theft in your area, consider setting up a watch with your local sailing club or motor group so that vessels are checked over regularly.
Frequent patrols should also help deter thieves from targeting you in the first place.