Juan was a character who appeared in only five episodes in Season 3. He was portrayed by Michael Krost. He is Carlos' little brother.
- Juan lives with Carlos, his mother, and his father.
- Best Friend: Julie
- If the Shoe Fits... (first appearance)
- Any Way You Slice It
- Gone Fishing!
- Who's Who on the Choo Choo?
- Hats Off to BJ! (last apppearance)
- Barney Songs (video) (scene segments only)
- Barney's Musical Scrapbook (scene segments only)
- Barney's Stu-u-upendous Puzzle Fun! (scene segments only)
- Juan never appeared with Derek, Tina, Stephen, or Ashley and Alissa.
- Juan is mentioned by Carlos in Room for Everyone, Shopping for a Surprise!, It's Raining, It's Pouring..., and Are We There Yet?, even though he does not appear in any of those Season 3 episodes.
- Although he has never been in the rest of the Season 3 series, he can be seen in the opening of Season 3, and his name is also mentioned in the credits of Season 3.