Pettitte (46), Posada (20) and Williams (51) will raise the Yankees' total of retired numbers to 20. The Yankees also are expected to at some point retire Derek Jeter's No. 2, their last single digit number in use.
Williams will be honoured before the May 24 game against Texas and Randolph as part of Old Timers' Day before the June 20 game against Detroit. Posada's ceremony will be on Aug. 22, followed by Pettitte's the next day.
Williams joined Jeter as part of the group that won four World Series titles in a five-year span from 1996-2000, and Posada, Pettitte and Jeter won five titles in all.
Their numbers join those of Billy Martin (1), Babe Ruth (3), Lou Gehrig (4), Joe DiMaggio (5), Joe Torre (6), Mickey Mantle (7), Yogi Berra and Bill Dickey (8), Roger Maris (9), Phil Rizzuto (10), Thurman Munson (15), Whitey Ford (16), Don Mattingly (23), Elston Howard (32), Casey Stengel (37), Mariano Rivera (42), Reggie Jackson (44) and Ron Guidry (49).
Randolph was a part of championship teams in 1977 and '78, is a former Yankees' co-captain and was a coach for 11 seasons.