Ojarumaru (おじゃる丸) is a Japanese anime series created by Rin Inumaru, produced by NHK Enterprises, and animated by Gallop. The series has aired on NHK Educational TV since October 1998, making it the second longest-running anime on NHK behind Nintama Rantaro, and the third longest-running anime series to date. The series focuses on a 5-year-old Heian-era prince named Ojarumaru Sakanoue who accidentally time-warps to modern Japan and has adventures there while dodging a trio of young oni who try to get back a scepter that he stole from Great King Enma. The series has been dubbed in many languages. It was the first NHK anime series to be animated using the digital ink-and-paint process instead of cel animation.

It received an "Excellence Award" for animation at the 1999 Japan Media Arts Festival.