Major League Baseball assigned 24 umpires to the 2023 American and National League Division Series round of the MLB postseason featuring Orioles-Rangers, Astros-Twins (ALDS), Braves-Phillies, and Dodgers-Diamondbacks (NLDS). Crew Chiefs are Alfonso Márquez, Bill Miller, Mark Carlson, and Todd Tichenor.
Crew Chiefs are indicated in bold text and by the -cc suffix with regular season crew chiefs denoted by an asterisk (*). Those working their first Division Series are marked with ^1st DS^ postseason will be noted with a ^1st Postseason^ mark. The following listings feature Game 1 configurations such that the plate umpire from Game 1 will work right field in Game 2, and all other umpires will move clockwise (e.g., 3B becomes 2B). Games 4 and 5 plates are if necessary.
AL Division Series (Baltimore Orioles vs Texas Rangers) Umpires:
HP: Lance Barrett [Game 1 Plate] [3 WC, 3rd Division Series, 1 LCS]
1B: John Libka ^1st DS^ [Game 2 Plate] [1 WC, 1st Division Series]
2B: Alfonso Márquez* -cc [Game 3 Plate] [3 WC, 12th Division Series, 6 LCS, 4 WS]
3B: Cory Blaser [Game 4 Plate] [3 WC, 5th Division Series, 2 LCS]
LF: Quinn Wolcott [Game 5 Plate] [3 WC, 4th Division Series, 1 LCS]
RF: Nic Lentz [2nd Division Series]
AL Division Series (Houston Astros vs Minnesota Twins) Umpires:
HP: Brian Knight [Game 1 Plate] [3 WC, 5th Division Series, 1 LCS]
1B: DJ Reyburn [Game 2 Plate] [2 WC, 4th Division Series, 1 LCS]
2B: Bill Miller* -cc [Game 3 Plate] [6 WC, 11th Division Series, 8 LCS, 4 WS]
3B: Jansen Visconti [Game 4 Plate] [1 WC, 2nd Division Series]
LF: John Tumpane [Game 5 Plate] [2 WC, 4th Division Series, 1 LCS]
RF: Roberto Ortiz ^1st DS^ [1 WC, 1st Division Series]
NL Division Series (Atlanta Braves vs Philadelphia Phillies) Umpires:
HP: Brian O'Nora [Game 1 Plate] [7th Division Series, 1 LCS, 1 WS]
1B: Ben May ^1st DS^ [Game 2 Plate] [1 WC, 1st Division Series]
2B: Mark Carlson* -cc [Game 3 Plate] [2 WC, 7th Division Series, 6 LCS, 2 WS]
3B: David Rackley [Game 4 Plate] [4 WC, 3rd Division Series, 1 LCS]
LF: Chris Guccione [Game 5 Plate] [6 WC, 8th Division Series, 5 LCS, 2 WS]
RF: Ramon De Jesus ^1st DS^ [1 WC, 1st Division Series]
NL Division Series (LA Dodgers vs Arizona Diamondbacks) Umpires:
HP: Vic Carapazza [Game 1 Plate] [2 WC, 6th Division Series, 2 LCS]
1B: Gabe Morales [Game 2 Plate] [2 WC, 2nd Division Series]
2B: Todd Tichenor* -cc [Game 3 Plate] [3 WC, 6th Division Series, 3 LCS, 1 WS]
3B: Will Little [3 WC, 5th Division Series, 1 LCS]
LF: Jim Wolf [3 WC, 6th Division Series, 5 LCS, 2 WS]
RF: Ryan Additon ^1st Postseason^ [1st Division Series]
Division Series Replay Review: Nestor Ceja, Bruce Dreckman, Junior Valentine, Chad Whitson.
Video as follows: