Noggin was a cable channel in the United States that is aimed at preschoolers. The channel was rebranded as Nick Jr. on September 28, 2009.
The channel was originally a joint venture of Sesame Workshop and Nickelodeon launched February 2, 1999, and the early programming included classic episodes of Sesame Street, under the title Sesame Street Unpaved, and 1993-1994 episodes under the title 123 Sesame Street (episodes from 1998 and later were added to this series in 2002), as well as other Sesame Workshop programs, including The Electric Company, 3-2-1 Contact, Square One TV and Ghostwriter. A Noggin original series titled Phred on Your Head Show often featured select Sesame skits. Additionally, Noggin was the original broadcaster for Play With Me Sesame, which now airs on PBS Kids Sprout.
The Jim Henson Company held a passive 12.5% stake in Noggin until it was sold, along with Henson's rights to the Sesame Street characters, to Sesame Workshop in 2000. In 2002, Sesame Workshop sold its half to Viacom, and the Sesame Workshop shows were eventually removed from the schedule. After Sesame Workshop left, Noggin still ran their archive programmings until May 2005.
Noggin ended its relationship with Sesame Workshop on September 10, 2007, causing all Sesame Workshop programming to be removed from the schedule.
Noggin also ran a couple of Sesame Street sketches in between shows; one such sketch was "How Crayons are Made". However, the audio was removed, and was replaced by narration from Noggin host Moose A. Moose.
Around the channel's beginning, comedian Joel Hodgson (Mystery Science Theater 3000) and his brother Jim were working with the Jim Henson Company to create a children's show for Noggin. It was never produced. 
For a time, the rebranded Nick Jr. continued to air Pinky Dinky Doo, a non-Muppet production that is co-produced by Sesame Workshop.