The Tanzer 25 is a recreational keelboat built by Tanzer Industries of Dorion, Quebec. It was built in 1986, the year Tanzer went bankrupt. It has a fractional sloop rig.
Designed by the French company of Joubert-Nivelt, the fibreglass hull a transom-hung rudder.
The boat was built with a standard keel that gives a draft of . A shoal-draft keel with a draft of , was a factory option.
It displaces and carries of ballast.
The boat is normally fitted with a small inboard motor or outboard motor for docking and maneuvering.
The design has sleeping accommodation for four people, with a double "V"-berth in the bow cabin and an aft cabin with a double berth on the port side. The galley is located on the port side just forward of the companionway ladder. The galley is equipped with a two-burner stove and a sink. A navigation station is opposite the galley, on the starboard side. The head is located just aft of the companionway on the starboard side. Cabin headroom is .
The boat has a PHRF racing average handicap of 180 with a high of 174 and low of 189. It has a hull speed of .
After Tanzer closed, the design passed to other builders, including Canadian Yacht Builders, Challenger Yachts and Mirage Yachts.