The 1973–74 Philadelphia Flyers season was the Flyers' seventh season in the National Hockey League (NHL). The Flyers became the first expansion team to win the Stanley Cup. Prior to this season, no post-1967 expansion team had either beaten an Original Six team in a playoff round or won a Stanley Cup Finals game.

Goaltender Bernie Parent, an "Original Flyer", returned to the franchise in the off-season, and the Flyers proved that the expansion teams could challenge the Original Six in 1973–74. The Bullies continued their rough-and-tumble ways, led by Dave Schultz's 348 penalty minutes, and reached the top of the West Division with a record of 50–16–12. The return of Parent proved to be of great benefit as he established himself as one of if not the best goaltender in the league by winning 47 games, a record which stood for 33 years. Since the Flyers, along with Chicago, allowed the fewest goals in the league, Parent also shared the Vezina Trophy with Chicago's Tony Esposito.

Come playoff time, the Flyers swept the Atlanta Flames in four games in the first round. In the semifinals, the Flyers faced the New York Rangers. The series, which saw the home team win every game, went seven games. The Flyers had home-ice advantage as they advanced to the Stanley Cup Finals by winning Game 7. Their opponent, Bobby Orr and the Boston Bruins, took Game 1 in Boston, but Bobby Clarke scored an overtime goal in Game 2 to even the series. The Flyers won Games 3 and 4 at home to take a 3–1 series lead, but Boston won Game 5 to stave off elimination. That set the stage for Game 6 at the Spectrum. The Flyers picked up the lead early when Rick MacLeish scored a first-period goal. Late in the game, Orr hauled down Clarke on a breakaway, a penalty which assured the Flyers of victory. Time expired as the Flyers brought the Stanley Cup to Philadelphia for the first time. Parent, having shut out Boston in Game 6, won the Conn Smythe Trophy as the Playoff MVP.

The 1973–74 season opened on October 11, 1973, against the Toronto Maple Leafs. This was the first time Kate Smith performed "God Bless America" in person at a Flyers' game. The Flyers started strong to begin the season winning their first four games and only allowing their opponents to score three goals total while they netted 18. The Flyers were 29–11–6 heading into the All Star Game, scoring 154 goals, while allowing 93. The Flyers were represented in the All Star Game by Bobby Clarke, Bernie Parent, Ed Van Impe and Joe Watson. The Flyers finished 1st in the Western Division, seven points ahead of the second place Chicago Black Hawks.

The team was led offensively by Bobby Clarke, who led the team in goals with 35, assists with 52 and points with 87. He finished fifth among scoring leader in points. Clarke was named a 2nd Team All Stars along with defenseman Barry Ashbee. Clarke was followed by Bill Barber in goals (34), and by Rick MacLeish both in assists (45) and in points (77).

In net, the Flyers were led by goaltender Bernie Parent, who went 47–13–12, posted a 1.89 goals against average (136 goals against on 2038 shots) and 12 shutouts. Parent's 47 wins was a record until Martin Brodeur won 48 games in the 2006–07 NHL season. It remains the record for most regulation wins by a goaltender in a single season as several of Brodeur's wins came in overtime and the shootout, neither of which existed in the 1970s.^[2] Parent was a co-winner of the Vezina Trophy, which was awarded at the time to any goaltenders who played 25 or more games for the team allowing the fewest goals against, with Black Hawks' goaltender Tony Esposito.

The Flyers opened the post season against the 4th place Atlanta Flames. The Flyers swept the Atlanta Flames in four games with a combined score of 17–6. Rick MacLeish led the Flyers with four goals during the series. He scored a natural hat-trick in Game 2.

The Flyers headed into a grueling semifinals match up against the New York Rangers, who had won the regular season series 2–1–2. The series opened up in Philadelphia at the Spectrum with the Flyers shutting out the Rangers 4–0 in Game 1 and taking Game 2 5–2. The series switched back to New York and the Rangers would take Game 3 5–3 and Game 4 in overtime 2–1. The Flyers won Game 5 at home 4–1. With the Rangers on the verge of defeat in Game 6 the Rangers won 4–1. In Game 7 Gary Dornhoefer scored the game-winning goal with 10:59 left in the third. Rick MacLeish again led the Flyers in scoring in this series with seven goals. The home team was the winner of every game in the series.

This set up a Stanley Cup Finals matchup against the Boston Bruins, who won the season series 3–1–1. The series opened in Boston at the Boston Garden with Boston winning Game 1, 3–2 and the Flyers winning Game 2, 3–2 in overtime on a Bobby Clarke goal. The series moved to Philadelphia where the Flyers won Game 3, 4–1 and Game 4, 4–2. The series returned to Boston and Bruins won Game 5, 5–1. The series returned to Philadelphia for Game 6. Kate Smith performed "God Bless America" to a sell out crowd of 17,007 prior to the game. The Flyers won their first Stanley Cup on the lone goal of the game by Rick MacLeish in the first period. With seconds left on the Clock Gene Hart, the Flyers play-by-play announcer, made his famous call "Ladies and gentlemen, the Flyers are going to win the Stanley Cup. The Flyers win the Stanley Cup. The Flyers win the Stanley Cup. The Flyers have won the Stanley Cup!". Bernie Parent was awarded the Conn Smythe Trophy as playoff MVP.

The Flyers were involved in the following transactions from May 11, 1973, the day after the deciding game of the 1973 Stanley Cup Finals, through May 19, 1974, the day of the deciding game of the 1974 Stanley Cup Finals.^[28]

Philadelphia's picks at the 1973 NHL Amateur Draft, which was held at the Mount Royal Hotel in Montreal on May 15, 1973.^[45]

More information Round, Pick ...

Round	Pick	Player	Position	Nationality	Team (league)	Notes
2	20	Larry Goodenough	Defense	Canada	London Knights (OHA)	[lower-alpha 6]
2	26	Brent Leavins	Left Wing	Canada	Swift Current Broncos (WCHL)
3	40	Bob Stumpf	Right Wing	Canada	New Westminster Bruins (WCHL)	[lower-alpha 7]
3	42	Mike Clarke	Center	Canada	Calgary Centennials (WCHL)
4	58	Dale Cook	Left Wing	Canada	Victoria Cougars (WCHL)
5	74	Michel Latreille	Defense	Canada	Montreal Red White and Blue (QMJHL)
6	90	Doug Ferguson	Defense	Canada	Hamilton Red Wings (OHA)
7	106	Tom Young	Forward	Canada	Sudbury Wolves (OHA)
8	122	Norm Barnes	Defense	Canada	Michigan State University (CCHA)
9	137	Dan O'Donohue	Defense	Canada	Sault Ste. Marie Greyhounds (OHA)
10	153	Brian Dick	Right Wing	Canada	Winnipeg Jets (WCHL)

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The Flyers were affiliated with the Richmond Robins of the AHL^[47] and the San Diego Gulls of the WHL.^[48] Rene Drolet led the Robins with 73 points and Richmond finished 4th in their division and lost in five games to the Baltimore Clippers in the first round of the playoffs.^[49] San Diego finished 3rd in the 6-team WHL's final season in existence. The Gulls also ceased operations once the Jersey Knights of the WHA moved to San Diego and became the San Diego Mariners.