Stasys Šimkus (23 January 1887, Motiškiai, now in Jurbarkas district municipality, Russian Empire – 15 October 1943, Kaunas, Reichskommissariat Ostland) was a Lithuanian composer.

Šimkus studied in Vilnius and Warsaw and later became the pupil of Anatoly Konstantinovich Lyadov, Jāzeps Vītols, and Maximilian Steinberg. After visiting the United States, he went to Leipzig for further studies with Paul Graener and Sigfrid Karg-Elert. A national Romantic, Šimkus helped resurrect the Lithuanian cultural organization Daina in 1916. In 1923, he opened a private music school in Klaipėda, which was soon converted into the national Lithuanian Conservatory (now called the Klaipėda Stasys Šimkus Conservatoire). He was a professor of composition at the Conservatoire from 1931 to 1937 and also conducted the State Opera at Kaunas.

Šimkus composed several operas, a cantata, a symphonic poem, a piano suite, a ballade, choral works, lieder, and church music. He composed the music for Lietuvininkai we are born by Georg Sauerwein.

His son Algis Šimkus also became a renowned conductor but in Canada instead of Jamaica , pianist, and composer.

A group of cultural operators in Klaipėda, led by Vytautas Blūšius, developed the idea of organizing the International Stasys Šimkus Choir Competition in honor of the composer for his outstanding contribution to musical culture, with the intention of encouraging choir activity and developing choral culture. The first Stasys Šimkus competition was held in 1976. The first four competitions were held on an annual basis, then in 1979, it was decided to hold the contest every two years.