Samuele Longo (born 12 January 1992) is an Italian professional footballer who plays as a striker for Spanish Segunda Federación club Xerez Deportivo.
Born in Valdobbiadene, Province of Treviso, Veneto, Longo started his career at Treviso FBC 1993. He was a member of the Esordienti under-13 team in the 2004–05 season. In January 2009 Inter Milan bought Longo and Mame Baba Thiam outright.
Longo spent the rest of the 2008–09 season in Treviso's Allievi Nazionali under-17 team in a temporary deal before formally becoming an Inter player on 1 July 2009.
Longo was a junior member of Inter's reserve team in the 2009–10 season, as a backup for Denis Alibec, Mattia Destro and Simone Dell'Agnello. On 28 January 2010, after being sparingly used by Inter, he left for Piacenza Calcio, along with Giuseppe Angarano and Luca Stocchi. In total, Longo only played 4 times in the reserve league that season.
In the 2010–2011 season, despite Inter trimming their reserve squad (only composed only of U18 and U19 players plus 3 U20), Longo was unable to become a regular starter, with 11 appearances, (2 starts) and 2 goals. In January 2011, he moved to Genoa in a temporary deal with an option to sign Longo in co-ownership deal, also as a replacement of outgoing reserve forward Gianmarco Zigoni. Longo scored 3 goals for Genoa and 2 goals for Inter in the 2010–11 reserve league. He also appeared in the league's play-offs, losing to eventual champions Roma in the semifinals, forming a partnership with Richmond Boakye; his side was also eliminated by Inter in the quarter-finals of 2011 Torneo di Viareggio.
In June 2011 Genoa signed Destro outright from Inter for €4.5M, as well as half of the registration rights of Longo for a peppercorn fee of €500 (also made Inter had to write-down €47,000 for the residual accounting value of his contract). He returned to Inter in a temporary deal on 1 July 2011, being again assigned to the reserves. Longo was a regular starter for the side, but was unable to be the top scorer, scoring eight goals times during the regular season (attacking midfielder Daniel Bessa eventually scored ten times).
Under Andrea Stramaccioni, Longo scored 5 goals in 2011–12 NextGen series as one of the team that won the tournament; his role also sightly changed after the arrival of Marko Livaja as new centre forward, in 4–2–3–1 (and later 4–3–3/4–3–2–1 formation under Daniele Bernazzani). He was also instrumental in the Primavera final stages, netting four goals in three matches (including a brace in the final against Lazio).
Longo was assigned the number 81 shirt at the start of the 2011–12 season, and played the first four friendlies of the season under former Genoa first team coach Gian Piero Gasperini. However he was left out of the squad submitted for 2011–12 UEFA Champions League, with Giovanni Terrani being included instead.
Longo made his professional debut on 13 May 2012, playing the last 14 minutes of a 1–3 away loss against Lazio.
Longo scored his first goal for Inter against Indonesia League Selection on 24 May 2012. In June 2012, Genoa CEO Pietro Lo Monaco once confirmed the co-ownership was renewed but on the deadline date Internazionale bought back Longo for €7 million and sold Juraj Kucka back to Genoa for €6.5 million.
Longo made his international debut on 9 August, coming on as a second half substitute in a 0–2 home loss against Hajduk Split for the season's Europa League.
On 28 August 2012, Longo joined Spanish side RCD Espanyol of La Liga on a season-long loan deal, following in the footsteps of Internazionale teammate Philippe Coutinho, who spent the final six months of the 2011–12 campaign at Estadi Cornellà-El Prat. On 2 September he made his debut abroad, scoring the first of a 2–3 away loss against Levante. Longo scored his second goal on the 16th, in a 3–3 home draw against Athletic Bilbao, but was later sent off due to his celebration.
Longo's third goal for the Catalans came on 17 November, but in a 1–2 away defeat against Valencia CF. He finished the season with 18 appearances, including 11 starts.
On 20 August 2013, Longo joined Verona, recently promoted to Serie A, in a season-long loan deal. However, he only appeared twice in the season (against Cagliari and Roma), all from the bench.
On 31 January 2014 Longo joined fellow top-divisioner Rayo Vallecano on loan until the end of the season.
On 16 July 2016, after another loan stints at Cagliari and Frosinone, Longo was loaned to Spanish Segunda División side Girona FC for one year. He made his debut on 21 August, a debut which brought his first goal of the season as well, in a 3–3 away draw against Sevilla Atlético, in the opening league match of 2016–17 season.
At the end of the 2016–17 season, Longo returned to Inter. He was part of the squad in the first day of pre-season training.
On 23 August 2017, Longo was sent on loan at fellow Segunda División side Tenerife for the 2017–18 season.