Ultraman R/B (ウルトラマンR/B(ルーブ), Ultraman Rūbu) is a Japanese tokusatsu superhero television series produced by Tsuburaya Productions. It is the 30th entry to the Ultra Series overall, the sixth entry to the "New Generation Heroes" lineup and the last entry to the series released in the Heisei era. It aired on TV Tokyo on July 7, 2018.

The series's main catchphrases are "This is the story of us, brothers. Starting out as Ultraman." (これは俺たち兄弟の物語。ウルトラマン、はじめます。, Kore wa oretachi kyōdai no monogatari. Urutoraman, hajimemasu.) and "Color me with your power! R/B!!" (オレ色に染めあげろ！ルーブ!!, Ore-iro ni someagero! Rūbu!!).