Amateur Growing up, Smith played junior hockey with the Toronto Nationals U16 AAA and
St. Michael's College School in
Toronto,
Ontario. While with St. Michael's, he participated in the CJHL All-Star Game and served as both captain and assistant captain during his career. In his final season with the team, Smith was named their Most Valuable Player after recording 75 points. Prior to entering his freshman season with the
Miami University's RedHawks, Smith won a bronze medal at the
2008 World Junior A Challenge and was drafted in the third round, 69th overall, by the
Dallas Stars in the
2009 NHL entry draft. Following the draft, Smith began his freshman season with the Redhawks in the
Central Collegiate Hockey Association (CCHA) while majoring in sport studies. During the season, he was also selected to take part in Canada's National Junior Team selection camp. Upon returning to the RedHawks for his sophomore season, Smith experienced a breakout year and recorded 54 points in 38 games. Smith led the nation's underclassmen in goals and points while also ranking seventh overall in the country for points. As a result of his success during his sophomore year, Smith was named to the All-Florida College Classic Team, voted first team all-CCHA, named to the CCHA all-Tournament Team, College Hockey News Second-Team All-America, and INCH Third-Team All-America.
First-Team All-America, and finalist for the RBC Financial Group CCHA Player of the Year.
Professional Dallas Stars (2011–2013) On March 25, 2012, Smith relinquished his final year at Miami to sign a three-year, entry-level contract with the
Dallas Stars. He made his NHL debut on March 28, 2012, against the
Edmonton Oilers and skated for five shifts. Smith played 4:05 minutes of ice time and recorded one shot on goal in the 3–1 loss. He played two more games with the Stars before they concluded their regular season. During his first 11 games in the AHL, he had recorded three assists. He was promoted to Dallas for the season once play resumed in January 2013 and scored his first career NHL goal on February 15, 2013, against
Cory Schneider of the
Vancouver Canucks. His second goal came a few days later in a 4–3 loss to the
Calgary Flames. As a result of his early success, Smith was promoted to a top six position in February and played left wing on a line with
Derek Roy and
Loui Eriksson. After playing in 28 games for Dallas, and recording six points, he was reassigned to the AHL alongside defenseman
Joe Morrow. He was recalled shortly thereafter after recording one goal and one assist during a game against the
Houston Aeros.
Boston Bruins (2013–2015) In July 2013, Smith was included in a blockbuster trade between Dallas and the
Boston Bruins, which sent him,
Loui Eriksson,
Joe Morrow and
Matt Fraser to Boston in exchange for
Tyler Seguin,
Rich Peverley and
Ryan Button. During the pre-season, Smith was placed on the Bruins' third line with Chris Kelly and
Carl Söderberg. However, as a result of injuries, Smith was moved up to a line with
Patrice Bergeron and Loui Eriksson. He finished the regular season with 19 goals and 30 assists which included 17 points throughout November. As a result of his success, the
New England Sports Network (NESN) TV network named Smith the 45th annual "7th Player." The "7th Player" is awarded to the Boston Bruin who most exceeded all expectations that season, as voted by the team's fans. The following year, Smith finished with 13 goals and 27 assists, plus four goals and an assist in 12 playoff games. During his first season with the team, Smith recorded a new career high 50 points in 82 games and tied for third on the team in goal scoring. On July 3, 2016, Smith signed a five-year, $25 million contract extension with the Panthers. Following the contract extension, Smith had a self described "disappointing year" after he recorded 15 goals and 22 assists in the
2016–17 season.
Vegas Golden Knights (2017–2023) On June 21, 2017, Smith was traded at the
2017 NHL expansion draft to the
Vegas Golden Knights due to salary cap issues. Both he and teammate
Jonathan Marchessault were acquired by the Golden Knights, with the Panthers receiving a fourth-round pick in the
2018 NHL entry draft. During his tenure in Florida, Smith had 87 points in 162 games. Following the trade, Smith began the
2017–18 season as a winger with
William Karlsson and Marchessault. Their line received early praise for being amongst the team's best lines, with them all scoring high by November. Upon entering January, Smith had become a prominent fixture on the first line as they had combined for 19 goals and 24 assists. The following month, Smith was recognized as an
NHL Third Star of the Month of February after posting 20 points in 14 games. Smith would go on to score a career-high 60 points in the regular season as the Knights advanced all the way to the
2018 Stanley Cup Final. During their postseason run, Smith scored five goals and 17 assists. Following his career-high season, Smith stayed consistent with his offensive abilities and recorded the second-best statistical season of his career. He tied Marchessault for the team lead in assists with 34 and surpassed the 50-point mark for the second season in a row. Upon returning to the Knights, Smith remained with Marchessault and Karlsson and recorded his 100th career NHL goal in a 4–2 win over the
Pittsburgh Penguins on October 11, 2018. Later that season, he also appeared in his 500th career NHL game, while also maintaining eight points in his past three games. As the Knights qualified for the Stanley Cup playoffs for the second consecutive year, Smith recorded one goal and five assists in their series against the
San Jose Sharks. As the playoffs continued, Smith experienced an 11 game goal drought which was snapped in Game 5 of the
Western Conference Final against the Dallas Stars. Following the naming of Mark Stone as team captain, Smith was appointed an alternate captain alongside
Alex Pietrangelo. While playing in his 628 career game, Smith recorded his first professional
hat-trick in a 4–1 win over the
St. Louis Blues on May 9, 2021. On July 13, 2022, Smith signed a three-year, $15 million contract to remain with the Golden Knights. By the
2022–23 season, Smith was one of six remaining original members of the Golden Knights, alongside Marchessault, Karlsson,
Brayden McNabb,
Shea Theodore and
William Carrier. The team reached the
Stanley Cup Final for the second time, winning the Cup over the
Florida Panthers in five games. Smith and four of the other original Golden Knights started the decisive Game 5.
Pittsburgh Penguins (2023–2024) On June 28, 2023, Smith was traded by the Golden Knights to the
Pittsburgh Penguins in exchange for a third round pick in the
2024 NHL entry draft. The move was precipitated by the Golden Knights' desire to retain newly-acquired forward
Ivan Barbashev, with general manager
Kelly McCrimmon stating "to get there, we moved Reilly to Pittsburgh to facilitate some of the other moves that we want to make." During the first game of the
2023–24 season, Smith and
Bryan Rust scored in the first 41 seconds of the third period to become the second-fastest Penguins teammates to score at the start of a period in franchise history.
New York Rangers (2024–2025) On July 1, 2024, Smith was traded by the Penguins to the
New York Rangers in exchange for a conditional fifth-round draft pick in
2025 and a second-round draft pick in the 2027 draft.
Return to Vegas (2025–present) On March 6, 2025, Smith was traded by the Rangers back to the Golden Knights, in exchange for
Brendan Brisson and a third-round draft pick in 2025. Following the season, Smith signed a further one-year extension to remain with Vegas, avoiding free agency. ==Career statistics==