Sylvain Jean Lefebvre (born October 14, 1967) is a Canadian professional ice hockey coach and former player who currently serves as an assistant coach for the Florida Panthers of the National Hockey League (NHL). Originally undrafted by teams in the NHL, he played for five franchises between 1989—2003, and won the Stanley Cup with the Colorado Avalanche in 1996.
After two seasons with the Leafs, Lefebvre was traded to the Quebec Nordiques as part of the Wendel Clark-Mats Sundin deal on June 28, 1994. He would play the next five seasons with the Quebec Nordiques/Colorado Avalanche, including a Stanley Cup victory in 1996, before signing a four-year, $10-million US contract with the New York Rangers (that secured a club option for him to play a fifth season at $3-million) during the 1999 offseason.
Seeing a decrease in productivity after several injuries, including a shattered index finger which occurred while blocking a shot, Lefebvre's career-low in points came in the 2002–03 season where he managed just two points over 35 games played. After four years with the Rangers, Lefebvre left the NHL and decided to join old friend Sebastien Bordeleau for one season with Switzerland-based SC Bern of the Nationalliga A where he and his team won the league championship prior to his retirement from active play.
In June 2012, Lefebvre became the head coach of the Hamilton Bulldogs, the AHL affiliate of the Montreal Canadiens. Following the Canadiens' purchase and subsequent relocation of the Bulldogs franchise to become the second iteration of the St. John's IceCaps in 2015, Lefebvre was kept on as head coach. In 2017, the Canadiens' AHL franchise was again relocated, becoming the Laval Rocket, whereas Lefebvre remained with the team. After finishing with the worst record in the AHL during the team's inaugural 2017–18 season, Lefebvre was relieved of his head coaching duties in April 2018.
Lefebvre then spent three seasons with the AHL's San Diego Gulls as an assistant coach before, in June 2021, it was announced that he accepted a promotion to the NHL as assistant coach with the Columbus Blue Jackets. However, this ultimately fell through with Lefebvre being replaced on September 13, 2021 due to his decision not to get a COVID-19 vaccine.
Prior to the beginning of the 2022–23 NHL season, Lefebvre was named as an assistant coach for the Florida Panthers. In 2024, Lefebvre won the Stanley Cup for the second time in his career, the first within his coaching capacity.
| 1984–85 | Laval Voisins | QMJHL | 31 | — |
| 1985–86 | Laval Titan | QMJHL | 48 | 25 |
| 1986–87 | Laval Titan | QMJHL | 44 | 12 |
| 1986–87 | Sherbrooke Canadiens | AHL | — | 0 |
| 1987–88 | Sherbrooke Canadiens | AHL | 73 | 4 |
| 1988–89 | Sherbrooke Canadiens | AHL | 119 | 4 |
| 1989–90 | Montreal Canadiens | NHL | 61 | 2 |
| 1990–91 | Montreal Canadiens | NHL | 30 | 6 |
| 1991–92 | Montreal Canadiens | NHL | 91 | 2 |
| 1992–93 | Toronto Maple Leafs | NHL | 90 | 20 |
| 1993–94 | Toronto Maple Leafs | NHL | 79 | 16 |
| 1994–95 | Quebec Nordiques | NHL | 17 | 2 |
| 1995–96 | Colorado Avalanche | NHL | 49 | 12 |
| 1996–97 | Colorado Avalanche | NHL | 30 | 25 |
| 1997–98 | Colorado Avalanche | NHL | 48 | 4 |
| 1998–99 | Colorado Avalanche | NHL | 48 | 12 |
| 1999–00 | New York Rangers | NHL | 43 | — |
| 2000–01 | New York Rangers | NHL | 55 | — |
| 2001–02 | Hartford Wolf Pack | AHL | 11 | — |
| 2001–02 | New York Rangers | NHL | 23 | — |
| 2002–03 | New York Rangers | NHL | 10 | — |
| 2003–04 | SC Bern | NLA | 14 | 44 |
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