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Oscar De La Hoya is calling out the SCARIEST boxer in the world -- telling TMZ Sports if he does decide to get back in the ring, he wants to fight undefeated human annihilator Gennady Golovkin!!!!!

The 42-year-old Golden Boy was leaving the Belasco Theater in L.A. when we asked how he felt about being called out by Shane Mosley and Roy Jones Jr.

That's when Oscar dropped the bombshell ... saying, "If I ever come back, and I think about it every day, I'll fight Triple G!"

BOOOOOOOOM!!!!!

For the record, Golovkin is 33-0 ... with 20 CONSECUTIVE KNOCKOUTS!!!!!