Charles Mayer (21 March 1799 – 2 July 1862), also known as Carl Mayer or Charles Meyer, was a Prussian pianist and composer active in the early 19th century. Mayer was born in Königsberg. His father was a clarinetist who, soon after Charles's birth, moved to Saint Petersburg and four years later to Moscow. He received his early musical education from his mother, followed by extended studies with John Field (1782–1837), with whom he continued to study after the family returned to Saint Petersburg after the Moscow fire of 1812. His first successful tour as a concert pianist in 1814 led him to Poland, Germany, Holland, and France, before he settled in Saint Petersburg in 1819. During another celebrated concert tour of 1845 he travelled through Scandinavia (where he became an honorary member of the Royal College of Music in Stockholm), Germany (Hamburg, Leipzig) and Austria (Vienna). Following the rise of Adolf von Henselt in Saint Petersburg, Mayer withdrew to Dresden in 1846, and died there.
Mayer was a busy and successful teacher who is supposed to have taught some 800 pupils in Saint Petersburg. He was reputed to have taken over the calm and musical (rather than virtuoso) technique established by Field. His most prominent pupils included the Russian pianist and composer Mikhail Glinka and Polish composer Filipina Brzezinska-Szymanowska.
Mayer wrote almost exclusively for the piano, producing more than 350 works for the instrument. His main body of work includes a number of studies, sets of variations on popular melodies, character pieces and dances.