Spencer Pratt's putting more distance between himself and the Republican Party -- telling his followers he's not running for either major political party because he's not a fan of politicians.

The former reality star turned mayoral candidate took to X to clarify his party affiliation -- or lack thereof -- Saturday ... sharing a photo of his name on the ballot.

Pratt notes his name doesn't have a "D" for Democrat or "R" for Republican on it ... he's not part of either tribe, as he calls them.

Pratt says he's not part of a political party because he hates politicians ... he's a concerned Angeleno asking for more out of his local government.

This may surprise some who heard him explain to Elex Michaelson the other day why he became a Republican.

ICYMI, Pratt says he became more aligned with the GOP during his early reality show days ... when people started threatening him and Heidi Montag -- and they were told by law enforcement to get guns as added protection.

Dems were too anti-gun, Pratt says ... so he embraced the Republican party. While he might personally be a Republican, his message is quite clear ... he's running as a candidate for all Angelenos -- regardless of party affiliation.

Pratt's distance from the Republican party comes after a couple prominent conservatives -- President Donald Trump and Erika Kirk -- threw their support behind him.

After the prez showed his support, Spencer told us ... "Everybody wants me to succeed because L.A. is the most important city in the country" -- not turning down Trump's endorsement but not embracing it either.

Worth noting ... all L.A. mayoral candidates run without a political party on the ballot -- even longtime politicians like Karen Bass, who served as a Democrat in Congress for more than decade, run without a party affiliation.