The 1978 National League Championship Series was a best-of-five matchup for the second straight year between the West Division champion Los Angeles Dodgers and the East Division champion Philadelphia Phillies. The Dodgers beat the Phillies three games to one once again and lost the World Series to the New York Yankees, as they had the year before.

Los Angeles won the series, 3–1.

Because of having to start an NL East-clinching game a few days earlier, Phillies ace Steve Carlton was not available for the start of the series, leaving the task to Larry Christenson, who did not fare well. After the Phillies scored a run in the second when Greg Luzinski hit a leadoff triple and scored on Mike Schmidt's sacrifice fly off of Burt Hooton, a double and error by third baseman Schmidt put runners on first and second with one out for the Dodgers in the third. Reggie Smith's RBI single tied the game before n a three-run homer by Steve Garvey put the Dodgers up 4–1. A two-run homer by Davey Lopes in the fourth made it 6–1 Dodgers. Next inning, Garvey tripled with one out off of Christenson, who was relieved by Warren Brusstar. Ron Cey's RBI single then made it 7–1 Dodgers. In the bottom of the inning, three singles loaded the bases with one out before Garry Maddox drove in two runs with a single. One out later, Richie Hebner's RBI single made it 7–4 Dodgers. In the sixth, Steve Yeager's home run off of Rawly Eastwick made it 8–4 Dodgers. In the ninth, Garvey's leadoff home run off of Tug McGraw made it 9–4 Dodgers. The Phillies got that run back in the bottom of the inning on Jerry Martin's home run off of rookie Bob Welch, but with one out, Welch struck out Maddox looking to end the game, earning the win, as the Dodgers took a 1–0 series lead.

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