The Thomas 35, also called the T-35, is an American sailboat that was designed by Graham & Schlageter as a racer-cruiser and first built in 1988.^[1][2][3][4]

The design was initially built by Thomas Marine of Arlington Heights, Illinois, starting in 1988 and later by Tartan Marine in Painesville, Ohio, United States, but it is now out of production.^[1][3][5][6]

The Thomas 35 is a recreational keelboat, built predominantly of fiberglass, with wood trim. It has a fractional sloop, with some later production boats supplied with a masthead sloop rig instead. The hull has a raked stem, a reverse transom, transom, an internally mounted spade-type rudder controlled by a tiller and a fixed fin keel. It displaces 9,800 lb (4,445 kg) and carries 4,450 lb (2,018 kg) of lead ballast.^[1][3]

The boat has a draft of 6.83 ft (2.08 m) with the standard keel.^[1][3]

The boat is fitted with a Japanese Yanmar 3GM diesel engine of 27 hp (20 kW) for docking and maneuvering. The fuel tank holds 20 U.S. gallons (76 L; 17 imp gal) and the fresh water tank has a capacity of 35 U.S. gallons (130 L; 29 imp gal).^[1][3]

The design has sleeping accommodation for eight people, with a double "V"-berth in the bow cabin, two straight settee berths and two additional upper pilot berths in the main cabin and two aft cabins with a single berths. The galley is located on the port side at the companionway ladder. The galley is L-shaped and is equipped with a two-burner stove, an ice box and a sink. A navigation station is opposite the galley, on the starboard side. The head is located just aft of the bow cabin on the port side and includes a shower. Cabin headroom is 74 in (188 cm).^[1][3][7]

For sailing downwind the design may be equipped with a symmetrical spinnaker.^[1]

The design has a hull speed of 7.4 kn (13.7 km/h).^[3]

The boat was named as Sailing World's Boat of the Year for 1990.^[7]

• List of sailing boat types