Prince Joachim of Prussia (27 September 1876 – 24 October 1939) was a member of the House of Hohenzollern. He was the second eldest son of Prince Albert of Prussia and his wife Princess Marie of Saxe-Altenburg. He is notable for composing music, in particular military waltzes.

Prince Joachim's paternal grandparents were Prince Albert of Prussia and Princess Marianne of the Netherlands. His maternal grandparents were Ernst I, Duke of Saxe-Altenburg and Agnes of Anhalt-Dessau.

Joachim had two brothers: Friedrich Heinrich Albrecht (1874–1940) and Friedrich Wilhelm (1880–1925).

In 1885, Joachim's father Prince Albert was chosen as regent for the Duchy of Brunswick. Like all male Hohenzollerns, Joachim and his brothers entered the army and became officers. Music always appealed to him however, and he soon made a name for himself composing. In 1898, he presented a military waltz he wrote to a family gathering at the Neues Palais in Potsdam. An orchestra played it, while Emperor Wilhelm (another Hohenzollern lover and composer of music) conducted it with his baton. In 1905, he wrote the libretto and pantomime for "The Apple of Paris", which was well received in Berlin. He also composed ballets and symphonies, and wrote a volume of poetry and painted. During World War I, Joachim served with distinction until he received a war wound. This wound effectively ended his military career and allowed him to completely focus on his music.

On 3 September 1919, Joachim married Marie Blich-Sulzer in Ischl, Austria. The marriage was never recognized by the family, and he had many public clashes with ex-Emperor Wilhelm. According to some sources, a previous marriage had led to Wilhelm banishing him by stationing him with the German colonial army in Africa; it is also believed that his resignation was demanded. His inheritance was also dramatically reduced. He married secondly to Karoline Kornelia Stockhammer on 9 October 1920 in Vienna. He and Karoline divorced in 1936.

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