The Red Sox have lost four World Series; in 1946 and 1967 against the St. Louis Cardinals, in 1975 against the Cincinnati Reds and in 1986 against the New York Mets. All four World Series were lost in seven games.
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The Red Sox have won 7 World Series: 1903, 1912, 1915, 1916, 1918, 2004 and 2007.
The Red Sox won the World Series in 2004. They had last won the World Series in 1918. That is a time span of 86 years.
The Boston Red Sox won 8 World Sries titles 1903, 1912, 1915, 1916, 1918, 2004, 2007 & 2013.
Through the 2014 season, the Red Sox have won the World Series a total of eight times--1903, 1912, 1915, 1916, 1918, 2004, 2007 and most recently in 2013.