Johann Strauss II (October 25, 1825 – June 3, 1899), also known as Johann Baptist Strauss or Johann Strauss, Jr., the Younger, or the Son (German: Sohn), was an Austrian composer of light music, particularly dance music and operettas. He composed over 400 waltzes, polkas, quadrilles, and other types of dance music, as well as several operettas and a ballet. In his lifetime, he was known as "The Waltz King", and was largely then responsible for the popularity of the waltz in Vienna during the 19th century.

Strauss had two younger brothers, Josef and Eduard Strauss, who became composers of light music as well, although they were never as well known as their elder brother.