There are two artists named Castor.

1. Castor was an American indie rock/emo band from Champaign-Urbana, Illinois. Formed in 1994, they were known for their "fluid" sound, often changing time signatures several times in a song while maintaining the flow of the music. They released two albums, the first self titled in 1995, the second Tracking Sounds Alone posthumously in 1998. Both albums are now out of print and only available in digital format online.

During their existence they toured with other influential Champaign-Urbana acts Braid and Hum amongst others.

Singer/guitarist Jeff Garber and bassist Derek Niedringhaus recorded an album under the band name "Big Bright Lights" in 1997 which was not released until 2001.

Garber went on to play in the bands National Skyline, The Joy Circuit, and Year of the Rabbit. Niedringhaus also joined National Skyline, later forming Centaur with Hum singer/guitarist Matt Talbott, the producer of their second album and only single.

2. A drum and bass artist.

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