The Eastern Zone was one of the three regional zones of the 1975 Davis Cup. 10 teams entered the Eastern Zone: 4 teams entered the competition in the Qualifying Rounds, with the winners of the 2 head-to-head ties progressing to the Preliminary Rounds, where they were joined by an additional 4 teams. From the 6 competing teams in the Preliminary Rounds, 3 head-to-head ties determined the winning teams who progressed to the main draw, joining the remaining 3 teams. Following a knockout competition, the winner of the main draw went on to compete in the Inter-Zonal Zone against the winners of the Americas Zone and Europe Zone.