UFC on ESPN: Blanchfield vs. Fiorot (also known as UFC on ESPN 54) was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on March 30, 2024, at Boardwalk Hall in Atlantic City, New Jersey, United States.

[2][3] The event marked the promotion's tenth visit to Atlantic City and first since UFC Fight Night: Barboza vs. Lee in April 2018.

[7] A light heavyweight bout between former UFC Light Heavyweight Championship challenger Dominick Reyes and Carlos Ulberg was scheduled UFC 297, but it was postponed due to an injury sustained by Ulberg and was rescheduled for this event.

[8] However, Reyes pulled out due to deep vein thrombosis and was replaced by Alonzo Menifield.

[9][10] In turn, the promotion opted to move the pairing to UFC on ESPN 56 on May 11 due to undisclosed reasons.