Lewellyn Farr "Lew" Christensen (May 6, 1909 – October 9, 1984) was a ballet dancer, choreographer and director for many companies. He was largely associated with George Balanchine and the San Francisco Ballet, which he directed from 1952–1984. Other companies Christensen was a part of include Ballet Caravan, directed by Lincoln Kirstein, and Ballet Society, directed by Kirstein and Balanchine.

Christensen was born in Brigham City, Utah, to a family with roots in dance and music. His grandfather, Lars Christensen, who emigrated from Denmark, taught folk and social dances. Christensen was raised a Mormon, and this upbringing informed his latter career with of a sense of focusing on propriety.

Christensen began studying dance with his uncles and music with his father when he was ten. He was taught early ballet technique by Stefano Mascagno, an Italian teacher. His brother Willam started Lew and their third dancing brother, Harold, in vaudeville. In addition to small vaudeville shows, the three brothers landed jobs in the Broadway musical The Great Waltz, during which time Christensen became a student at Balanchine's new School of American Ballet. In 1935, he joined the Metropolitan Opera's American Ballet Ensemble with Harold.

As soon as Christensen began his training, he received special attention from George Balanchine, who recognized his talent. Among Balanchine's first lead male dancers, Christensen danced principal roles, receiving much praise for his lead roles in Orpheus and Eurydice and Apollon Musagète. Christensen, the first American to dance Apollo, set a new standard for that role, and was thereafter considered to be America's first home grown significant male dancer.

At the onset of World War II, Lew Christensen was drafted into the United States Army. On return to New York in 1946 he joined Balanchine's and Kirstein's latest project, Ballet Society – later to be known as the New York City Ballet – where he became a ballet master. Although considered by many to be the logical heir to Balanchine's company, Christensen was instead enticed to join his brothers at the San Francisco Ballet in 1948.

Ballet Caravan, begun in 1936 by Kirstein, was intended to provide American ballet dancers with summer employment during off-seasons. As a member, Christensen was a lead soloist, choreographer, and ballet master until 1940.

Between 1936 and 1941 ballets Christensen choreographed included Pocahontas (1936), Filling Station (1938), Charade (1939), and Pastorela (1941). Filling Station incorporated Christensen's vaudeville roots, acrobats, deadpan humor, and tap dancing.

With Ballet Caravan, Christensen and his wife Gisella Caccialanza toured South America in 1941.