Lūcijs (Lucius) Endzelīns (21 May 1909, Dorpat (Tartu), Estonia – 27 October 1981, Adelaide, Australia) was a Latvian-Australian chess master.
In 1932, Endzelins tied for 3rd-5th with Fricis Apšenieks and Movsas Feigins, behind Vladimirs Petrovs, and Teodors Bergs, at the Riga championship.
At the end of World War II, Endzelīns, along with many other Baltic players (Arlauskas, Dreibergs, Jurševskis, Mednis, Ozols, Sarapu, Tautvaišas, Vaitonis, Zemgalis, et al.), escaped to the west just before the advancing Soviet forces arrived.
In 1946, he placed second, with 10.5/13, half a point behind Fedir Bohatyrchuk, in a round-robin event for displaced persons at Meerbeck.
[3] In 1947, he won, ahead of Elmārs Zemgalis and Efim Bogoljubow, at the Mattison Memorial Tourney in Hanau, Germany.