Thomas Baltzar (c. 1630 – 24 July 1663) was a German violinist and composer. He was born in Lübeck to a musical family; his father, grandfather, and great-grandfather were all musicians. Sources suggest an array of music teachers who may have taught him in his early years. According to the writings of Samuel Hartlib, composer and violinist Johann Schop was one of those instructors. Baltzar may have studied the violin with Gregor Zuber and composition with Franz Tunder. He may have also received instruction from composer and violinist Nicolaus Bleyer, who taught Baltzar's younger brother.