Kaspar Förster, also known as Caspar Foerster, was a German singer and composer born in Danzig (now Gdańsk, Poland) and baptized on February 28, 1616. He passed away on February 2, 1673, in Oliva, near Danzig. Förster was initially trained in music by his father, Kaspar Förster Sr., who was the Kapellmeister at the Marienkirche in Danzig. He continued his studies under Marco Scacchi in Warsaw and later under Giacomo Carissimi in Rome during the 1660s.

Förster's career included significant roles as a bass singer and choir conductor at the Polish court in Warsaw from approximately 1638 to 1643. He then became the Kapellmeister to Frederik III of Denmark in Copenhagen from 1652 until 1655. Following the outbreak of war between Denmark and Sweden in 1655, Förster returned to Danzig, where he served as cantor at the Marienkirche. He resumed his position in Denmark from 1661 to 1667 and made several visits to Venice, contributing to the dissemination of Italian musical styles in northern Europe.

Förster's compositions are primarily sacred cantatas for three voices, accompanied by two violins and continuo. Approximately 35 of these works survive, known for their challenging bass parts. His other compositions include two oratorios, six trio sonatas, and four secular cantatas. Förster's work played a significant role in introducing Italian musical influences to regions such as Danzig and Copenhagen.