The Schweizer SGS 1-34 is a United States Standard Class, single-seat, high-wing glider built by Schweizer Aircraft of Elmira, New York.

The 1-34 was designed over a number of years in the mid-1960s and first flew in 1969.

By the time the 1-34 was introduced it was no longer competitive in the Standard Class, but has proven very successful as a club aircraft.

The 1-34 was designed over several years to spread out the development costs. At the time the design work on the aircraft was started the Standard Class was new and described a very simple aircraft with terminal velocity dive brakes, fixed landing gear and no water ballast. By the time the 1-34 had flown in 1969 the Standard Class rules had changed to allow essentially unrestricted sailplanes with a 15 metre (49.2 feet) wingspan.

The SGS 1-34 is of all metal aluminum semi-monocoque construction. All surfaces are aluminum covered, with the exception of the rudder which is covered in aircraft fabric.

The 1-34 has the originally specified terminal velocity dive brakes, that limit the glider to below redline speeds in a vertical dive. Developing and testing these proved expensive and time consuming and this also extended the aircraft's development time.