Diego Luna

Luna joined the youth setup at Major League Soccer club San Jose Earthquakes in 2015. With the Earthquakes, Luna participated in various tournaments, including the Dallas Cup and Generation Adidas Cup. In 2018, Luna left the Earthquakes academy and joined the Barcelona Residency Academy, the Arizona-based academy for Spanish club Barcelona.

El Paso Locomotive

On April 5, 2021, Luna signed a professional contract with USL Championship club El Paso Locomotive. He made his debut for the club on May 8 in their season opening 1–1 draw against New Mexico United. He came on as a 78th-minute substitute for Richie Ryan. Following the match, as well as the second against Rio Grande Valley Toros, Locomotive head coach Mark Lowry said, "He has the mentality to go to the very top and we’re gonna help him do that." Luna scored his first professional goal for El Paso on June 3, the winning goal in a 1–0 road victory over Austin Bold. He headed in a crossed ball from Macauley King in the 56th minute to give his side all three points.

Real Salt Lake

On June 2, 2022, Luna transferred to Real Salt Lake in a USL record deal of $250,000. He made his debut as an 88th-minute substitute against Vancouver Whitecaps. As of August 2026 he has scored a total of 27 goals for Real Salt Lake.

Luna has received call-ups to camps with the US under-14, under-17, and under-20 youth national teams. In 2022, he featured prominently with the US U20 team that won the CONCACAF U-20 Championship, securing berths for the 2023 FIFA U-20 World Cup and the 2024 Olympics in the process. Luna earned his first selection to the senior national team in January 2024. After declining to join as an alternate for the US Olympic team that was set to participate in the 2024 Summer Olympics in Paris, Luna confirmed on July 23, 2024, that he had not ruled out filing a one-time switch to FIFA switching his allegiance with Mexico's Mexican Football Federation. On January 6, 2025, Luna was called up by Mauricio Pochettino for training camp and friendlies against Venezuela and Costa Rica. During the first half of the match against Costa Rica, Luna was elbowed in the face by a Costa Rican player and had his nose broken, but despite this Luna returned to the field to play through until halftime after having cotton shoved up his nostrils and changing to a fresh jersey after the previous had been bloodied. Luna provided an assist to Brian White's opening goal before going to the hospital for treatment after halftime, and in an interview following the end of the match which the United States won 3–0, Pochettino praised Luna's character and said that he had "big balls". On June 5, Luna was selected by Pochettino to represent the United States in the 2025 CONCACAF Gold Cup, He scored his first…

Club

As of match played September 9, 2026

International

As of match played November 18, 2025

Scores and results list United States goal tally first.

Luna was born in Sunnyvale, California to Mexican parents from the state of Michoacan. Luna began playing organized soccer at age 5 with the Palo Alto Soccer Club.