Niccolò "Nico" Mannion (born March 14, 2001) is an Italian-American professional basketball player for Olimpia Milano of the Lega Basket Serie A (LBA) and the EuroLeague.

[11] On December 1, Mannion scored 37 points, including the game-winning three-pointer, in an 82–80 victory over Shadow Mountain High School, who had won 73 straight games against Arizona opponents.

"[12] Five days later, Mannion recorded 33 points and 12 assists in a nationally televised game against top recruit Jalen Green and San Joaquin Memorial High School at the Hoophall West Invitational.

[14] On December 30, he scored 45 points in an 88–78 loss to Mater Dei High School at the Rancho Mirage Holiday Invitational National Division championship.

[16] On February 27, he led Pinnacle to a second Class 6A state title, posting 56 points, eight rebounds, and six assists in an 83–64 win over Chaparral High School.

[30] On November 28, Mannion posted 16 points and 11 assists and made a game-winning layup with four seconds left in a 93–91 victory over Pepperdine in the first round of the Wooden Legacy.

Mannion led his team to the Wooden Legacy title and was named tournament most valuable player (MVP) after averaging 16.3 points and 7.3 assists per game.

[36] After one season with the Warriors and after playing with the Italian national basketball team at the 2020 Summer Olympics, he opted to leave the United States for Virtus Bologna.

[37] On August 10, 2021, Mannion signed a two-year contract with Italian club Virtus Bologna of the Lega Basket Serie A,[38] a team with the ambition of winning the EuroCup and qualify to the EuroLeague.

[39] After having ousted Lietkabelis, Ulm and Valencia in the first three rounds of the playoffs, on 11 May 2022, Virtus defeated Frutti Extra Bursaspor by 80–67 at the Segafredo Arena, winning its first EuroCup and qualifying for the EuroLeague after 14 years.

[40] However, despite having ended the regular season at the first place and having ousted 3–0 both Pesaro and Tortona in the first two rounds of playoffs, Virtus was defeated 4–2 in the national finals by Olimpia Milano.

[41] On 29 September 2022, after having ousted Milano in the semifinals, Virtus won its third Supercup, defeating 72–69 Banco di Sardegna Sassari and achieving a back-to-back, following the 2021 trophy.

In June, after having ousted 3–0 both Brindisi and Tortona, Virtus was defeated 4–3 by Olimpia Milan in the national finals, following a series which was widely regarded among the best in the latest years of Italian basketball.

[49] Mannion holds dual citizenship to the United States and Italy; his father is American from Salt Lake City, while his Italian mother is from Guidonia Montecelio.