Johann Bernhard Logier (February 9, 1777 – February 13, 1846) was a German music teacher.Logier was born in Kassel, and was first taught music by his father, a violinist. He moved to the United Kingdom in 1805, where he received further instruction and spent the remainder of his life, except for a three-year stay in Berlin (1822–25). He died in Dublin in 1846.Logier invented the Chiroplast, a pedagogical device that guides the hands and fingers while playing the piano. He also developed his own teaching method, now called the Logier method, which he published in System der Musikwissenschaft (1827). In this method, several pupils are taught at a time, with technical instruction done together with instruction in principles of harmony.