Clifford's Puppy Days is an animated children's television series that originally aired on PBS Kids from September 1, 2003 to February 25, 2006. The prequel to the 2000–2003 series Clifford the Big Red Dog, it features the adventures of Clifford during his puppy days before he became a big red dog and before moving to Birdwell Island.

The series ended in February 2006 after two seasons and 39 episodes. Since then, occasional reruns continued to air, typically on holidays until April 2022.

In the United Kingdom, the series aired on CBeebies until early 2011 and like the original series, the prequel was dubbed with British voice actors, replacing the original American soundtrack.

The show featured Henry Winkler as the voice of Norville. For his role as Norville, Winkler was nominated for 2 Daytime Emmy Awards for Outstanding Performer in an Animated Program for his work on the series, one of which he won in 2005.