The aim of this lecture is to present on Mathematicians. Here briefly describe on some famous Mathematicians. First pure mathematician was Pythagoras (569 B.C.–475 B.C). Aristotle (384 B.C. – 322 B.C.); Studied mathematics in relation to science; Euclid (325 B.C. – 265 B.C.); Al-Khwarizmi (780 A.D.-850 A.D.); Leonardo da Vinci et. A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematics is concerned with numbers, data, quantity, structure, space, models and change.