Gigant Houou ("Kyutama Gattai Gigant Houou") is the personal large-scale mecha of Houou Soldier (Tsurugi Ohtori) from the Super Sentai series Uchu Sentai Kyuranger (2017–2018). Houou Soldier is the 88th Kyuranger, a legendary hero who had once saved the universe centuries earlier and joins the team partway through the show; his motif is the phoenix (Japanese: Houou). The series was only loosely adapted for Power Rangers in 2023 as the short Netflix mini-series Power Rangers Cosmic Fury. Because of that show's brief run, several of the original Voyagers went unused, the Houou Voyager among them. Neither Houou Soldier nor Gigant Houou was adapted for Cosmic Fury, so there is no official US name and no Hasbro release — the DX toy was a Japan-exclusive product.

In the show, Gigant Houou is formed from three modules: the phoenix-shaped Houou Voyager plus the Houou Station and Houou Base add-on parts. The combination is triggered by the Houou Kyutama, one of the spherical key pieces that drive the entire Kyuranger arsenal. As a standalone mecha it fights with a pronounced phoenix design and prominent wing elements. It can also link with the team's main robo, KyurenOh, to form the upgraded Gigant KyurenOh, so it serves both as a solo robot and as an enhancement for the team mecha.

The toy was released in July 2017 as DX Gigant Houou (entry number 12 in the Kyutama Gattai line) by Bandai Japan. The set contains the Houou Voyager, Houou Station and Houou Base along with the included DX Houou Kyutama; the modules assemble into the Gigant Houou figure. As is standard for the line, inserting a Kyutama triggers light and sound effects (powered by two AA batteries, sold separately). Construction is predominantly ABS plastic in the usual DX manner (any notable die-cast content is unconfirmed). Thanks to the shared Kyutama system, the model is compatible with the other Voyagers in the range and can be combined with the separately sold DX KyurenOh to form Gigant KyurenOh.