The 1875 Boston Red Stockings season was the fifth season of the Boston Red Stockings franchise. They won their fourth consecutive National Association championship.
Managed by Harry Wright, Boston finished with a record of 71–8 to win the pennant by 15 games. Pitcher Al Spalding started 62 of the Red Stockings' games and led the NA with 54 wins. Catcher Deacon White (.367), second baseman Ross Barnes (.364), and first baseman Cal McVey (.355) finished 1–2–3 in the league's batting race. McVey paced the circuit with 87 runs batted in, and outfielder Jim O'Rourke had the most home runs, with 6. The Boston offense scored more runs than any other team in the NA. According to the FiveThirtyEight ELO rating system, they are the greatest team of all time. 
Harry Wright, Al Spalding, Jim O'Rourke, and shortstop George Wright have all been elected into the Baseball Hall of Fame.
This was the last season of the Association, which dissolved at the end of the year. The Red Stockings club would join the new National League in 1876.
Player stats.
Batting.
Starters by position.
"Note: Pos = Position; G = Games played; AB = At bats; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in"
Other batters.
"Note: G = Games played; AB = At bats; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in"
Pitching.
Starting pitchers.
"Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; SO = Strikeouts"
Relief pitchers.
"Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; SO = Strikeouts"