The LAK-12 is a Lithuanian mid-wing, single-seat, FAI Open Class glider that was designed and produced by Lietuviškos Aviacinės Konstrukcijos (LAK) (English: Lithuanian Aircraft Builders) in Lithuania and later by Sportine Aviacija and Sport Aviation USSR.

The wings feature both double-panel upper surface air brakes and flaps that can be set to -7°, -4°, 0°, +5°, +11° and +15°.

Water ballast is 190 L (50 US gal) held in the wing leading edges and dumped through a centre-fuselage valve.

[1][3] According to Sportine Aviacija, the current type certificate holder, 253 were manufactured over a twenty-five year production run.

[4] In April 2018 there were 17 LAK-12s listed on the United States Federal Aviation Administration registry, all single-place and certified in the Experimental - Racing/Exhibition category and three registered with Transport Canada in the Limited Class.