Sorenson codec may refer to either of three proprietary video codecs: Sorenson Video, Sorenson Video 3 or Sorenson Spark. Sorenson Video is also known as Sorenson Video Codec, Sorenson Video Quantizer or SVQ. Sorenson Spark is also known as Sorenson H.263 or FLV1 (and it is sometimes incorrectly named as Flash Video (FLV), which is the name of Adobe Flash container format).

Both codecs were devised by Sorenson Media Inc. (formerly Sorenson Vision Inc.). Sorenson Video is used in Apple's QuickTime and Sorenson Spark in Adobe Flash (formerly Macromedia Flash).

The Sorenson Video codec first appeared with the release of QuickTime 3 on March 30, 1998. It was available in two versions: the Basic Edition encoder/decoder built into QuickTime 3 and Developer Edition which enabled advanced encoding features and two-pass variable bitrate. With QuickTime 4, it was given wide exposure for the release of the teaser trailer for Star Wars Episode I: The Phantom Menace on March 11, 1999.

Sorenson Video 2 was released in March 1999; however, it mainly included minor improvements and optimizations to the Developer Edition of the encoder, as movies encoded with it were backwards compatible with the Sorenson Video decoder.