Warren Spahn
Teams have thrown two straight no-hitters, with no other teams pitching one in the interim, 19 times; most recently by the Houston Astros (a combined no-hitter using 4 pitchers and Justin Verlander in 2019). The only team to throw three straight no-hitters was the Milwaukee Braves, with Lew Burdette, followed by consecutive no-no's by Warren Spahn, in 1960 and 1961. Individual pitchers have thrown two straight no-hitters seven times: Addie Joss 1908 and 1910; Vander Meer in 1938; Allie Reynolds in 1951; Warren Spahn in 1960 and 1961; Ryan twice, first in 1973, then in 1974 and 1975; and Bailey. All seven instances were with the same team.