Bowser Jr.’s mother has never been officially revealed in Mario canon, so the “real” answer is that her identity is unknown and intentionally left a mystery by Nintendo.

Official story so far

  • In Super Mario Sunshine, Bowser tells Bowser Jr. that Princess Peach is his mother, which makes Jr. believe it for most of the game.
  • At the end, Bowser admits to Jr. that he lied and that Peach is not his real mama, and Jr. quietly says he already knew.
  • Shigeru Miyamoto has jokingly answered the question by saying that he is Bowser Jr.’s mother, which most fans take as a playful way of saying “there’s no canon answer.”

So in terms of strict canon, Nintendo has never shown or named Bowser Jr.’s mom, and there is no confirmed character who fills that role.

Popular fan theories

Because Nintendo left the question open, fans have filled the gap with lots of theories and forum debates.

  • Peach is secretly his mom
    • Some argue Peach’s surprised but not outraged reaction in Sunshine hints at something more, and that Bowser might be hiding a complicated truth from Jr.
* Most people still treat this as speculation, since the ending scene clearly has Bowser saying she isn’t Jr.’s real mother.
  • A never‑seen “Mrs. Bowser”
    • Others imagine a blue Bowser or some off‑screen Koopa queen as Bowser’s wife and Jr.’s biological mother, sometimes pointing to an alternate-color Bowser in older games as inspiration.
* This stays firmly in fan‑theory territory, with no official support in games or guides.
  • Storks, magic, or Bowser as both parents
    • Some theories lean into the whimsical Mario logic: babies arriving by stork, or Bowser somehow “wishing” Jr. into existence.
* Another idea is that Bowser reproduces asexually, acting as both father and mother in a biological sense.

How creators have handled the joke

  • In Q&A videos and interviews, the question “Who is Bowser Jr.’s mom?” is treated as a running gag rather than a serious lore point.
  • Miyamoto’s joking claim that he himself is the mother underlines that the team likely doesn’t want to pin down a single canonical answer.

What this means for “who is Bowser Jr’s mom?”

If you’re asking in a strict, lore-accurate way:

  • The only solid, consistent answer is that Bowser Jr.’s mother is unknown and not officially defined in the Mario universe.

If you’re asking in a fun, fandom way:

  • You can pick your favorite theory—Peach, a mystery Koopa queen, stork delivery, a magical wish, or even “Miyamoto is his mom”—because none of them have been confirmed or disproven in a definitive way.

TL;DR: There’s no canon mom for Bowser Jr.; Nintendo keeps it as a running mystery and joke, which is exactly why fans still love debating “who is Bowser Jr’s mom” today.

Information gathered from public forums or data available on the internet and portrayed here.