The Philadelphia Phillies' 2008 season was the 126th in the history of the franchise. The team finished with a regular season record of 92–70, first in the National League East. In the postseason, the Phillies won the World Series; this was the first major sports championship for Philadelphia since the 76ers swept the 1983 NBA Finals. During the season, they were managed by Charlie Manuel. To date, this is the most recent season the Phillies won the World Series.

The Phillies opened the season by posting their first winning April since 2003. They also scored 60 runs over 5 games in late May in a sweep over the Colorado Rockies and accrued a 14–4 record over 18 games entering the month of June. The Phillies' performance declined in late June, but they improved after the All-Star break, going 9–6 immediately following the midseason hiatus. Closer Brad Lidge earned eight saves in those games, and did not blow a save throughout the season and the postseason. Philadelphia traded sweeps with the Los Angeles Dodgers in August and went 13–3 in their last 16 games, taking advantage of a late swoon by the New York Mets for the second year in a row to capture the division crown. The team won its position in the playoffs after its second consecutive East Division title. The Phillies also posted the best road record in the National League, at 44–37.

Philadelphia defeated the Milwaukee Brewers in the NLDS, 3–1, and the Dodgers in the NLCS, 4–1, to win the National League pennant and advance to the World Series. In the World Series, the Phillies defeated the Tampa Bay Rays, 4–1, to win their first championship in 28 years, ending the Curse of Billy Penn. Phillies starting pitcher Cole Hamels was named the Most Valuable Player of the NLCS and the World Series.

Statistical leaders in batting for the 2008 team included center fielder Shane Victorino (batting average, .293), first baseman Ryan Howard (home runs, 48; runs batted in, 146), and second baseman Chase Utley (runs scored, 113). For their accomplishments, Howard won the Josh Gibson Award for the National League, and Utley won his third consecutive Silver Slugger Award. Pitching leaders included left-handed starting pitcher Hamels (innings pitched, 227), left-hander starter Jamie Moyer (wins, 16), and right-handed relief pitcher Lidge (saves, 41). Lidge won the DHL Delivery Man of the Year and the Major League Baseball Comeback Player of the Year awards for his performance during the season. Victorino and shortstop Jimmy Rollins also won Gold Glove awards for their play in the field.

Offseason

Players and coaches On October 29, 2007, Charlie Manuel signed an extension to manage the Phillies for two more years. All of the coaches from the 2007 division championship season were also retained. However, Davey Lopes underwent treatment for cancer and had to be replaced on an interim basis in the early part of the season. The Phillies re-signed left-handed relief pitcher J. C. Romero to a new two-year contract after a dominating 2007, in which he struck out 42 batters in innings pitched while posting a 1.92 earned run average. Outfielder Michael Bourn and right-handed pitcher Geoff Geary were traded to Houston for closer Brad Lidge and infielder Eric Bruntlett on November 7, 2007. Outfielder Chris Roberson was traded to Baltimore for cash in January 2008, while third baseman Pedro Feliz, outfielder Geoff Jenkins, and outfielder So Taguchi arrived as free agents; Feliz was signed on January 31, while Jenkins and Taguchi signed the month before. In the broadcast booth, Tom McCarthy also returned to the team after two years as a radio announcer for the New York Mets.

Uniforms On November 29, 2007, the team announced that in honor of the franchise's 125th anniversary of playing in Philadelphia, the Phillies would wear an alternate home uniform based on their 1948 uniforms for all day home games during the season. The cap formerly used for interleague play, a red-crowned cap with a blue bill and a star within the "P" logo, was retired.

Controversy with the Mets

On February 16, 2008, Mets center fielder Carlos Beltrán made a statement regarding the upcoming season. He stated that "[without] Santana, we felt, as a team, that we had a chance to win in our division. With him now, I have no doubt that we're going to win in our division. I have no doubt in that. We've got what it takes. To Jimmy Rollins: We are the team to beat." Beltran's statement echoed Rollins' 2007 assertion that the Phillies were "the team to beat in the NL East—finally". Inasmuch as Beltran had imitated Rollins' 2007 preseason prediction, Rollins arrived in camp for Spring training and responded: "There isn't a team in the National League that's better than us. The pressure's back on them if you ask me. They were on paper the best team in the division last year and they were supposed to win, and they didn't. One, there are four other teams in our division who are going to make sure that doesn't happen, and two, has anyone ever heard of plagiarism? That was pretty good, especially coming from him. He's a quiet guy, so it was probably shocking when he said it. Not shocking in a bad way, like 'Wow, I can't believe he said that.' More like, 'Wow, he finally said something because he's a leader on that team and you definitely need to be a vocal leader.'"

Regular season

Monthly summaries

March/April

The Phillies opened the season against the Washington Nationals at home on March 31. They failed to win any of their first three series, losing two of three against the Nationals and New York Mets, with a four-game split against the Cincinnati Reds between those series. The Phillies won their next two series against the Chicago Cubs and the Houston Astros. After dropping a second series to the Mets, the Phillies finished the month with 15 wins and 12 losses. They did not achieve a three-game sweep against any team in the opening month, nor were they swept. By winning at least one game in each series, the Phillies were able to achieve their first winning April in several seasons.

With a batting average of .360 and his Major League Baseball-leading 11 home runs, Chase Utley paced the team's offense, followed closely by a resurgent Pat Burrell and his 25 runs batted in. Though team speed was hampered by the loss of Shane Victorino and Jimmy Rollins to the disabled list, the latter for the first time in his career, the Phillies still pushed forward to a 15–13 record, including their Opening Day loss to Washington. The pitching rotation was led by ace Cole Hamels, who led the team in wins (3), earned run average (ERA) (2.70), and innings pitched (). Reliever J. C. Romero and new closer Brad Lidge both went the entire month without sacrificing a single run, over and 11 innings respectively.

May The Phillies did not achieve their first three-game series sweep until almost the end of May, taking two from the San Francisco Giants, the Arizona Diamondbacks (splitting the series 2–2), the Atlanta Braves, and the Nationals, and dropping two to the Giants, the Toronto Blue Jays, and the Astros. However, the Phillies' first sweep was achieved in dramatic fashion, as the offense broke out for 60 runs in five games, including a 20–5 win over the Colorado Rockies.

Though several fill-in players, including Brad Harman and T. J. Bohn, substituted during Victorino's and Rollins' absence, none was more valuable to the team during May than Jayson Werth. Expected to be primarily a platoon player coming into the season, Werth showed positive form. While Utley slowed down, Werth had a game with three home runs and stole four bases in the month. However, as Rollins and Victorino returned, Werth was lost to the disabled list. Ryan Howard broke out of his early-season slump, batting .245 in May, nearly an 80-point increase from his average in April, and hitting ten home runs. Hometown pitcher Jamie Moyer also became the sixth pitcher in Major League Baseball history to defeat all 30 teams in the league on May 26 in a 20–5 Phillies win over Colorado.

June June was a tale of two halves for the Phillies, as they started June with a strong combination of offense and pitching. From May 26 to June 13, the team posted a 14–4 record, starting their run with a 15–6 win over the Astros and ended with a 20–2 win over the Cardinals, as their record reached a first-half high of 13 games over .500 at 41–28. However, the offense took a downturn as the Phillies pitchers began to sacrifice more runs in the latter part of the month. The Phillies went 3–11 over the remainder of June, as the pitchers allowed an average of 4.79 runs per game, compared to the offense's 3.36 runs scored per game. This was punctuated by a season-high six-game losing streak. The poor records coincided with the Phillies' stretch of interleague play for 2008, as they were swept by the Angels, and lost their series with the Red Sox, A's, and Rangers, in addition to dropping two NL series against the Cardinals and Marlins. While Hamels and Kyle Kendrick each managed to post a 3–1 record in the rotation, the other starters (Moyer, Adam Eaton, and Brett Myers) were not so lucky. Myers' poor performance received arguably the most scrutiny, based on management's decision to move him back to the rotation from the bullpen after the 2007 season. Myers would eventually accept an option to Triple-A to work on his mechanical issues and confidence.

July

July began with the announcement that Chase Utley and Brad Lidge would represent the team at the 2008 Major League Baseball All-Star Game; Utley garnered the most votes of all National League players. Pat Burrell was also selected as a "Final Vote" candidate, but lost out on the opportunity for his first All-Star appearance to Milwaukee outfielder Corey Hart. The Phillies went 8–5 in July before the All-Star break, compiling a four-game win streak, a four-game losing streak, and winning four of their last five. The team posted a sweep of the Braves, a series loss to the Mets, and series wins over the Cardinals and the Diamondbacks.

In a move to bolster their starting rotation in preparation for the pennant race, the Phillies traded three minor league players, including second baseman Adrian Cardenas, pitcher Josh Outman, and outfielder Matthew Spencer to the Oakland Athletics for starting pitcher Joe Blanton on July 17. The move would prove necessary, as Blanton's start was the only game of their next series against the Mets that the Phillies would win; bullpen pitchers earned the victory (Chad Durbin) or suffered the loss (Ryan Madson and Romero) in each game of the series. The Phillies managed to go 7–5 after the All-Star break within their own division, dropping series to the Marlins and Mets, but besting the Braves and sweeping the Nationals. Brad Lidge posted a save in six straight Phillies wins, and the team ended the month on a five-game winning streak, with a final record of 15–10.

August