Johann Friedrich Alberti (11 January 1642, Tönning, Schleswig – 14 June 1710, Merseburg, Saxony-Anhalt) was a German composer and organist.
He received his musical training in Leipzig from Werner Fabricius and in Dresden from Vincenzo Albrici. Then he worked as an organist in Merseburg cathedral until his departure in 1698 caused by the paralysis of his right hand because of a stroke. His pupil Georg Friedrich Kauffmann succeeded him as a princely Saxon townsman and cathedral organist at the court of the Saxon duke and Merseburg Cathedral. His name survives today because of his preference of writing left hand parts to be played in consecutive notes, rather than as block chords, which is still known to musicians as an "Alberti Bass".
Alberti's works include chorale preludes, 35 choral arrangements, 12 ricercati (lost) and various sacred works.