Oscar Manuel Collazo (born January 15, 1997) is a Puerto Rican professional boxer and unified mini flyweight champion who has held the World Boxing Organization (WBO) mini flyweight title since May 2023 and the World Boxing Association WBA (Super version) and Ring magazine titles since November 2024.

[7] Collazo moved up to flyweight for his next bout, against Francisco Bonilla on 25 March 2021, on the Amanda Serrano vs. Daniela Romina Bermúdez undercard.

[9] Collazo moved down to mini flyweight to face Pedro Villegas for the vacant WBO Latino minimumweight title on 3 December 2021.

[16] On January 30, 2023, the WBO ordered their mini-flyweight champion Melvin Jerusalem make a mandatory title defense against Collazo.

[22] Collazo was booked to make a voluntary championship defense against the ninth-ranked WBO mini-flyweight contender Garen Diagan on August 26, 2023, at the Roberto Clemente Coliseum in San Juan, Puerto Rico.

[24] On December 30, 2023, it was announced that Collazo would make his second WBO mini-flyweight championship defense against an unnamed opponent on the undercard of the Jaime Munguia and John Ryder super middleweight bout, which is expected to take place at the Footprint Center in Phoenix, Arizona on January 27, 2024.

[29] Collazo faced Knockout CP Freshmart for the unified WBO, WBA and the inaugural symbolistic The Ring minimumweight titles on November 16, 2024 in Riyadh, Saudi Arabia.