Nazareth Jersey Mitrou-Long (born August 3, 1993) is a Canadian-Greek professional basketball player for Olympiacos of the Greek Basket League and the EuroLeague.

He played with NBA players Tristan Thompson and Cory Joseph, and future Cyclone teammate Melvin Ejim while competing for REDA Red in the National Prep School Athletic Association in 2011–12.

He prepped at Montrose Christian (Rockville, Md) in 2009–10, teaming with Duke's Josh Hairston During his recruitment he received offers from Rice, Dayton, Creighton, and Miami, eventually committing to the Iowa State Cyclones.

He averaged 7.1 points per game and shot 40 percent from behind the arc, finishing fourth in the Big 12 in 3-point field goal percentage (40.0) and seventh in 3-pointers made (1.8).

[2] He earned Phillips 66 Big 12 Player of the Week honors after hitting 8-of-11 3-pointers in the Cyclones' season-opening win against UNC Wilmington and finishing with a career-high 26 points in the game.

Long played a key role in ISU's Big 12 Tournament run, making 7-of-10 threes and averaging 10 points and going 4-of-6 from behind the arc in the championship game against Baylor.

In the third round of the NCAA Tournament, Long hit three 3-pointers in the final 5:10, including one that tied the game at 81, as ISU rallied to defeat North Carolina.

[4] He averaged 7.1 points per game and shot 40 percent from behind the arc, finishing fourth in the Big 12 in 3-point field goal percentage (40.0) and seventh in 3-pointers made (1.8).

He was second in the Big 12 averaging 2.3 three-pointers made per game and finished the season tied for fifth in the league shooting 39.1 percent behind the arc.

[9] Mitrou-Long commented on his decision: "I feel the need to take time off to allow myself to rehab with our training staff to get back to where I can perform at my peak level on the basketball court".

[10] Iowa State coach Prohm supported Mitrou-Long's decision to sit out to rehabilitate, while adding his belief that the team could react in a positive manner.

[11] Going into his redshirt senior season, Long was named in the preseason All-Big 12 Second-Team,[12] receiving praise from coach Prohm for his work ethic, maturity and leadership.

[17] At the end of his redshirted senior season, Mitrou-Long would be named for the official All-Big 12 Second Team for the work he put in that year for Iowa State.

After showing promising results for his playing in Salt Lake City Stars, on December 22, 2017, Mitrou-Long signed a two-way contract with the Utah Jazz, taking the spot that was originally held by Nate Wolters.

Mitrou-Long made his NBA debut four days later, recording a three-pointer in a blowout 107–83 loss to the Denver Nuggets.

[26] On January 11, 2021, Mitrou-Long signed with the Fort Wayne Mad Ants of the NBA G League as an affiliate player.

[28] He averaged 17.5 points, 4.3 rebounds and 5 assists per game, leading the team to the 3rd place in the domestic league regular season standings.

On June 27, 2023, Mitrou-Long signed a two-year (1+1) deal with Žalgiris Kaunas of the Lithuanian Basketball League (LKL) and the EuroLeague.