Evangelos "Vangelis" Mantzaris (Greek: Ευάγγελος "Βαγγέλης" Μάντζαρης; born April 16, 1990) is a Greek professional basketball player and the team captain for Mykonos of the Greek Basketball League. He is a 1.96 m (6 ft 5 in) tall point guard. He has also represented the senior Greek national team in international competition.
Mantzaris began his professional career in the Greek 2nd Division with Peristeri, the team of his hometown. With Peristeri, he won the Greek 2nd Division championship in 2009.
On September 5, 2011, Mantzaris signed a four-year deal with the top-tier level Greek Basket League and EuroLeague club Olympiacos Piraeus. He won both the EuroLeague and Greek League championships in 2012, being a useful tool for the team of coach Dušan Ivković, especially due to his defensive ability.
In January 2013, Mantzaris suffered a season-ending knee injury, after rupturing the anterior cruciate ligament in his right knee during a Greek Basket League derby against PAOK Thessaloniki at PAOK Sports Arena. Despite suffering the knee injury, he remained close to his teammates both in and out of the locker room in order to support them, as they won the EuroLeague 2012–13 season championship. Mantzaris returned to action seven months later and in early October of the same year won the FIBA Intercontinental Cup against Pinheiros at Ginásio José Corrêa, Brazil. In the two finals, he averaged 9 points, 4.5 rebounds and 3 assists, helping Olympiacos to celebrate the title. On 29 July 2014, Mantzaris extended his contract with Olympiacos through 2017.
Mantzaris won the Greek League 2014–15 season and Greek League 2015–16 season national domestic championships with Olympiacos, under the instructions of former Houston Rockets assistant coach, Ioannis Sfairopoulos, being the starting point guard of his team in both seasons. He also competed in the 2015 EuroLeague Finals versus Real Madrid, in Madrid, and in the 2017 EuroLeague Finals against Fenerbahçe, in Istanbul, however without earning the trophy.
On June 16, 2017, Mantzaris signed a three-year contract extension with Olympiacos.
On July 20, 2019, Mantzaris was released from Olympiacos, after eight seasons, and signed with UNICS Kazan of the VTB United League and the EuroCup, playing under fellow Greek coach Dimitrios Priftis. He left in December, returning to Greece.
On December 30, 2019, Mantzaris returned to Greece and signed with EuroCup side Promitheas Patras. He averaged 10.5 points, 2.2 rebounds, 5.3 assists and 1.8 steals per game. On October 8, 2020, Mantzaris re-signed with the team.
On December 17, 2020, Mantzaris officially returned to Peristeri after nine years.
On August 6, 2021, he has signed with Stal Ostrów Wielkopolski of the Polish Basketball League. In four games he averaged five points, five assists, 3.3 rebounds, and 1.3 steals per game.
On October 4, 2021, Mantzaris signed with Hapoel Eilat of the Israeli Basketball Premier League.
On November 11, 2021, Mantzaris signed with PAOK of the Greek Basket League.
After the season ended, Mantzaris stated that the cooperation with coach Aris Lykogiannis was not good, something that confirmed the poor communication between them.
On September 22, 2022, Mantzaris moved to Ionikos Nikaias.
On March 24, 2023, Mantzaris signed with Venezuelan club Panteras de Miranda for the rest of the season.
On September 4, 2023, Mantzaris signed with Pallacanestro Roseto of the Italian third division.
Mantzaris returned to Greece signing with Mykonos for the 2024–2025 campaign and ultimately helped the club achieve promotion to the 1st division.
As a member of the junior national basketball teams of Greece, Mantzaris won the gold medal at the 2008 FIBA Europe Under-18 Championship and the silver medal at the 2009 FIBA Under-19 World Cup. Mantzaris also won the gold medal at the 2009 FIBA Europe Under-20 Championship, and the silver medal at the 2010 FIBA Europe Under-20 Championship, with Greece's junior national teams.