Otakar Zich (25 March 1879, Městec Králové – 9 July 1934 Ouběnice u Benešova) was a distinguished Czech composer and aesthetician.
In his music education he studied as a self-taught man. Very years later, he became a pupil of the prominent nineteenth-century Czech aesthetician Otakar Hostinský, and a protégé of the iconoclastic musicologist and critic Zdeněk Nejedlý. In the years 1903-1906 he taught physics and mathematics at the High School in Domažlice. In the years leading up to the First World War Zich lived in Prague, actively participating in musical life as a critic. In this capacity he supported the efforts of Nejedlý's pro-Smetana faction against the intellectual descendants of Antonín Dvořák, especially during the so-called Dvořák Affair 1911-1914, when he called into question the artistic integrity of Dvořák's compositional language. These activities firmly allied Zich with Nejedlý's academic circle at Charles University, where, in 1924, he was appointed professor of Aesthetics. He held this position until his death in 1934.
As a composer, Zich was largely self-taught, although he can be said to belong to the post-Smetana lineage of Czech composers (which includes Zdeněk Fibich, Josef Bohuslav Foerster, and Otakar Ostrčil, all connected in some way to Nejedlý). His main contributions to concert life in Prague were the operas Malířský nápad (The Artist's Idea, 1908), Vina (Guilt, 1915), and Preciézky (on Zich's own translation of Molière's Les précieuses ridicules, 1924). He also created several solo vocal and choral compositions. His musical style straddles the divide between late Romanticism and early neo-classicism, combining dense orchestration, Wagnerian leitmotifs, and an intensely linear counterpoint with a playful referentiality to past styles. With the exception of Preciézky and a few individual shorter works, most of Zich's music remains unpublished.