The 1998 National League Championship Series (NLCS), to determine the champion of Major League Baseball's National League, was played from October 7 to 14 between the East Division champion Atlanta Braves and the West Division champion San Diego Padres.

The Braves entered the playoffs for the seventh straight season with a franchise-record 106 regular season wins, an offense that hit 215 home runs, and a pitching staff made up of Greg Maddux, Tom Glavine, John Smoltz, Denny Neagle, and Kevin Millwood to the playoffs. However, they also carried the baggage of their embarrassing NLCS loss to the Florida Marlins the previous season. In the NLDS, the Braves swept Sammy Sosa and the Chicago Cubs.

After a 76–86 season in 1997, San Diego stormed out and took control of their division, finishing with a 98–64 record, their best in team history. The offense was led by the 50 home run club's newest member, Greg Vaughn, and by Hall of Famer Tony Gwynn. The San Diego rotation was anchored by eighteen-game winner Kevin Brown, who helped Florida defeat Atlanta in the 1997 NLCS, along with All-Star Andy Ashby and the series MVP Sterling Hitchcock. Closer Trevor Hoffman saved an astounding 53 games in the regular season. The Padres defeated the favored Houston Astros in four games in the NLDS.

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