Can i watch the super mario galaxy movie before the super mario bros movie?

Quick Answer
No, you cannot watch The Super Mario Galaxy Movie before The Super Mario Bros. Movie; the former is a 2026 sequel that follows the events of the 2023 original.
Explanation
The Super Mario Galaxy Movie is scheduled for release in 2026 and is officially a sequel to The Super Mario Bros. Movie, which premiered in 2023. Because the 2026 film continues the story from the 2023 film, it is intended to be watched after the original in order to follow the narrative progression. Additionally, the 2023 movie introduces the main characters and plot points that the 2026 sequel builds upon, so viewing the sequel first would result in missing essential context. Until the 2026 film is released, it is not possible to watch it at all. Therefore, the correct viewing order is to see The Super Mario Bros. Movie first, then The Super Mario Galaxy Movie once it becomes available.