Carl (Karl) Mayet (11 August 1810, Berlin – 18 May 1868, Stettin , now Szczecin) was a German chess master .
It was one of the most original of the Berlin Pleiades (the seven stars of German chess). 
In 1839, Mayet defeated Jozsef Szen in a match with (+ 3-2 = 1). In 1845, he drew a match with Augustus Mongredien with (+ 3-3). In 1847, he defeated A. von der Goltz in a match (+ 14-9 = 1), but then lost a match with his cousin Wilhelm Hanstein (+ 5-12 = 1). In 1848, he lost a match to Daniel Harrwitz (+ 2-5 = 2). In the London 1851 chess tournament , he was knocked out in round 1 when he lost to Hugh Alexander Kennedy with two losses. In 1851, he lost a match to Adolf Anderssen in Berlin with four losses. In 1852, he lost to Frederic Deacon (2-5).
In 1853, he took third place in the first unofficial Berlin Championship , behind Jean Dufresne and Max Lange . In 1853, he lost a match to Dufresne (+5-7). In 1855, he lost to Anderssen (+ 6-14 = 1). In 1856, he lost to T. Wiegelmann (2-4) in the 1856 Berlin Knockout Tournament. In 1859, he lost a match to Anderssen (+ 1-7). In 1865, he lost a match to Anderssen (+ 2-5 = 1). In 1866 he lost a match to Gustav Neumann (-6 = 1). 
- Jump up^ Chess Berlin Pleiades
- Jump up^ Edo Ratings, Mayet