Allen is a Scottish name and surname which means "handsome". Variant spellings include Alan, Allan, etc. The noble family of this surname, from which a branch went to Portugal, is descended of one Alanus de Buckenhall.

Allen may refer to:

Allen as a taxonomical authority may refer to:

Dr. Josef Allen Hynek (May 1, 1910 – April 27, 1986) was a United States astronomer, professor, and ufologist. He is perhaps best remembered for his UFO research. Hynek acted as scientific adviser to UFO studies undertaken by the U.S. Air Force under three consecutive names: Project Sign (1947–1949), Project Grudge (1949–1952), and Project Blue Book (1952 to 1969). For decades afterwards, he conducted his own independent UFO research, developing the Close Encounter classification system, and is widely considered the father of the concept of scientific analysis of both reports and, especially, trace evidence purportedly left by UFOs.

Hynek was born in Chicago to Czech parents. In 1931, Hynek received a B.S. from the University of Chicago. In 1935, he completed his Ph.D. in astrophysics at Yerkes Observatory. He joined the Department of Physics and Astronomy at Ohio State University in 1936. He specialized in the study of stellar evolution and in the identification of spectroscopic binaries.

Lily Rose Beatrice Cooper (born 2 May 1985), better known as Lily Allen, is an English recording artist, actress and fashion designer. She is the daughter of actor and musician Keith Allen and film producer Alison Owen. In her teenage years, her musical tastes evolved from glam rock to alternative. Allen abandoned school and concentrated on improving her performing and compositional skills. Afterwards, she created several demo songs and, near the end of 2005, she created a profile on MySpace where she made some of her recordings public.

A contract was signed with the label Regal Recordings, as the views on MySpace rose to tens of thousands. In 2006, she began to work on completing what would be her first studio album and its first mainstream single "Smile" reached the top position on the UK Singles Chart in July 2006. Her debut record, Alright, Still, was well received on the international market, selling over 2.6 million copies and brought Allen a nomination at the Grammy Awards, BRIT Awards and MTV Video Music Awards. She then began hosting her own talk-show, Lily Allen and Friends, on BBC Three.