Zachary M. Bogosian (born July 15, 1990) is an American professional ice hockey defenseman for the Buffalo Sabres of the National Hockey League (NHL). Bogosian was regarded as a complete, physical defenseman who could contribute on both offense and defense; he was rated as one of the top players heading into the 2008 NHL Entry Draft, where the Atlanta Thrashers selected him third overall. Bogosian first played in an international tournament when he joined the American national team at the 2009 IIHF World Championship.

In 2004, Bogosian entered high school at Cushing Academy, a prep school in Massachusetts. The assistant coach of the school's hockey team was Ray Bourque, a former NHL defenseman who was elected to the Hockey Hall of Fame. Bogosian's teammates at Cushing included his older brother, Aaron, and Bourque's son, Ryan. While at Cushing he was used mostly as a fifth or sixth defenseman and played few minutes as a result. After his second year at the school, Bogosian was selected 19th overall in the 2006 Ontario Hockey League (OHL) Priority Draft by the Peterborough Petes Bogosian's decision to play in the OHL rather than go to the NCAA differed from most of his teammates, including his brother. As his father and uncle had also played college football in the NCAA, it was expected that Bogosian would follow them in going to university. He cited watching Ottawa 67's games at age nine as a major influence in deciding to play in Canada.

Bogosian began playing for the Petes in the 2006–07 season. He played 67 games for the team and finished with 7 goals and 26 assists for 33 points, which was second on the team in points for both rookies and defensemen.^[4] In recognition of his season, he was named to the OHL's Second All-Rookie Team, as one of the top four rookie defensemen in the league. The next season, Bogosian appeared in 60 games for the Petes. He led his team in scoring with 61 points (11 goals, 50 assists), the only defenseman in the league do so;^[6] the 50 assists he scored were second in the league among defensemen.^[7] The Petes reached the playoffs after missing the previous year, and Bogosian added another three assists in five games. During the season, he participated in both the OHL All-Star Classic and the CHL Top Prospects Game, an all-star game of prospects from the three leagues in the Canadian Hockey League (Western Hockey League, Quebec Major Junior Hockey League and OHL). At the conclusion of the season, Bogosian was named one of the five draft-eligible finalists for the Red Tilson Trophy as most outstanding player in the OHL, and was also named to the OHL First All-Star Team as one of the two best defensemen in the league.

Prior to the 2008 NHL Entry Draft, Bogosian was ranked by the NHL Central Scouting Bureau as the second best North American skater for the draft and the third ranked prospect out of the OHL. He was drafted third overall by the Atlanta Thrashers behind Steven Stamkos and Drew Doughty. He was noted by his coach in Peterborough, Vince Malette, to be a "very physical defenseman who is a complete player" and defensively solid who could skate well with the puck and not lose speed. Thrashers general manager Don Waddell liked the physical aspect Bogosian brought to a game, as well as his ability to help score goals while at the same time stop other teams' top players. Bogosian had been noted prior for the draft for his dedication to training, as he drove more than 90 minutes to Ottawa to get a better work out.

Bogosian was born to Ike and Vicky Bogosian in Massena, New York, a town of 13,000 adjacent to the Saint Lawrence River. He is the first NHL player of Armenian descent; his great-grandfather, Stephen Bogosian, left Western Armenia in 1923 at the age of 16 as a result of the Armenian Genocide. At the age of 2½, Bogosian first began to skate. He joined the Massena Minor Hockey Association when he was 3, staying in the program until he was 14, when he left for Cushing Academy. Bogosian first began to play defense at the Squirt level (under-10); though he was smaller than most of his peers, he was a good skater. He alternated between forward and defense throughout minor hockey. When he began attending Cushing Academy he was a forward the first year, before he converted to a defender full-time. After leaving the school and moving to Canada with two years of high school to complete, Bogosian took courses on the internet.

Zach has two older brothers, Ike Jr. and Aaron. Aaron was also a professional ice hockey player who attended St. Lawrence University where he played four seasons with the Saints. Aaron most recently played in the ECHL with the Florida Everblades.

Ike was an athlete when he was younger, playing college football with Syracuse University from 1979 to 1981. In his senior season at Syracuse he was co-captain of the team with future New York Giants running back Joe Morris. He currently runs a carpet and floor cleaning business with his brother in Massena. Vicky works as a hairdresser.

He is married to Boston Breakers and former United States women's national under-23 soccer team midfielder Bianca D'Agostino.