This page contains records for interleague championships (à la the World Series and the All-Star Game) before the merger of the American League and the National League as Major League Baseball in 2000.
American Association-National League Interleague Championships
| Season | World Series Championship |
| 1884 | Providence Grays 3-0 New York Metropolitans (best-of-five) |
| 1885 | Chicago White Stockings 3-3-1 (tie) St. Louis Browns (best-of-seven) |
| 1886 | St. Louis Browns 4-2 Chicago White Stockings (best-of-seven) |
| 1887 | Detroit Wolverines 10-5 St. Louis Browns (best-of-fifteen continuing-play) |
| 1888 | New York Giants 6-4 St. Louis Browns (best-of-eleven) |
| 1889 | New York Nadjies 6-3 Brooklyn Bridegrooms (best-of-eleven) |
| 1890 | Brooklyn Bridegrooms 3-3-1 (tie) Louisville Colonels (best-of-seven) |
American League-National League Interleague Championships
The National League was officially the National League and American Association for the 1903 series.
| Season | World Series Championship |
| 1903 | Boston Puritans 5-3 Pittsburg Buccaneers (best-of-nine) |
| 1904 | Not played |
| 1905 | New York Giants 4-1 Philadelphia Athletics (best-of-seven) |
| 1906 | Chicago White Sox 4-2 Chicago Cubs (best-of-seven) |
| 1907 | Chicago Cubs 4-0-1 Detroit Tigers (best-of-seven) |
| 1908 | Chicago Cubs 4-1 Detroit Tigers (best-of-seven) |
| 1909 | Pittsburg Pirates 4-3 Detroit Tigers (best-of-seven) |
| 1910 | Philadelphia Athletics 4-1 Chicago Cubs (best-of-seven) |
| 1911 | Philadelphia Athletics 4-2 New York Giants (best-of-seven) |
| 1912 | Boston Red Sox 4-3-1 New York Giants (best-of-seven) |
| 1913 | Philadelphia Athletics 4-1 New York Giants (best-of-seven) |
| 1914 | Boston Braves 4-0 Philadelphia Athletics (best-of-seven) |
| 1915 | Boston Red Sox 4-1 Philadelphia Phillies (best-of-seven) |
| 1916 | Boston Red Sox 4-1 Brooklyn Robins (best-of-seven) |
| 1917 | Chicago White Sox 4-2 New York Giants (best-of-seven) |
| 1918 | Boston Red Sox 4-2 Chicago Cubs (best-of-seven) |
| 1919 | Cincinnati Reds 5-3 Chicago White Sox (best-of-nine) |
| 1920 | Cleveland Indians 5-2 Brooklyn Robins (best-of-nine) |
| 1921 | New York Giants 5-3 New York Yankees (best-of-nine) |
| 1922 | New York Giants 4-0-1 New York Yankees (best-of-seven) |
| 1923 | New York Yankees 4-2 New York Giants (best-of-seven) |
| 1924 | Washington Nationals 4-3 New York Giants (best-of-seven) |
| 1925 | Pittsburgh Pirates 4-3 Washington Nationals (best-of-seven) |
| 1926 | St. Louis Cardinals 4-3 New York Yankees (best-of-seven) |
| 1927 | New York Yankees 4-0 Pittsburgh Pirates (best-of-seven) |
| 1928 | New York Yankees 4-0 St. Louis Cardinals (best-of-seven) |
| 1929 | Philadelphia Athletics 4-1 Chicago Cubs (best-of-seven) |
| 1930 | Philadelphia Athletics 4-2 St. Louis Cardinals (best-of-seven) |
| 1931 | St. Louis Cardinals 4-3 Philadelphia Athletics (best-of-seven) |
| 1932 | New York Yankees 4-0 Chicago Cubs (best-of-seven) |
| 1933 | New York Giants 4-1 Washington Senators (best-of-seven) |
| 1934 | St. Louis Cardinals 4-3 Detroit Tigers (best-of-seven) |
| 1935 | Detroit Tigers 4-2 Chicago Cubs (best-of-seven) |
| 1936 | New York Yankees 4-2 New York Giants (best-of-seven) |
| 1937 | New York Yankees 4-1 New York Giants (best-of-seven) |
| 1938 | New York Yankees 4-0 Chicago Cubs (best-of-seven) |
| 1939 | New York Yankees 4-0 Cincinnati Reds (best-of-seven) |
| 1940 | Cincinnati Reds 4-3 Detroit Tigers (best-of-seven) |
| 1941 | New York Yankees 4-1 Brooklyn Dodgers (best-of-seven) |
| 1942 | St. Louis Cardinals 4-1 New York Yankees (best-of-seven) |
| 1943 | New York Yankees 4-3 St. Louis Cardinals (best-of-seven) |
| 1944 | St. Louis Cardinals 4-2 St. Louis Browns (best-of-seven) |
| 1945 | Detroit Tigers 4-3 Chicago Cubs (best-of-seven) |
| 1946 | St. Louis Cardinals 4-3 Boston Red Sox (best-of-seven) |
| 1947 | New York Yankees 4-3 Brooklyn Dodgers (best-of-seven) |
| 1948 | Cleveland Indians 4-2 Boston Braves (best-of-seven) |
| 1949 | New York Yankees 4-1 Brooklyn Dodgers (best-of-seven) |
| 1950 | New York Yankees 4-0 Philadelphia Phillies (best-of-seven) |
| 1951 | New York Yankees 4-2 New York Giants (best-of-seven) |
| 1952 | New York Yankees 4-3 Brooklyn Dodgers (best-of-seven) |
| 1953 | New York Yankees 4-2 Brooklyn Dodgers (best-of-seven) |
| 1954 | New York Giants 4-0 Cleveland Indians (best-of-seven) |
| 1955 | Brooklyn Dodgers 4-3 New York Yankees (best-of-seven) |
| 1956 | New York Yankees 4-3 Brooklyn Dodgers (best-of-seven) |
| 1957 | Milwaukee Braves 4-3 New York Yankees (best-of-seven) |
| 1958 | New York Yankees 4-3 Milwaukee Braves (best-of-seven) |
| 1959 | Los Angeles Dodgers 4-2 Chicago White Sox (best-of-seven) |
| 1960 | Pittsburgh Pirates 4-3 New York Yankees (best-of-seven) |
| 1961 | New York Yankees 4-1 Cincinnati Reds (best-of-seven) |
| 1962 | New York Yankees 4-3 San Francisco Giants (best-of-seven) |
| 1963 | Los Angeles Dodgers 4-0 New York Yankees (best-of-seven) |
| 1964 | St. Louis Cardinals 4-3 New York Yankees (best-of-seven) |
| 1965 | Los Angeles Dodgers 4-3 Minnesota Twins (best-of-seven) |
| 1966 | Baltimore Orioles 4-0 Los Angeles Dodgers (best-of-seven) |
| 1967 | St. Louis Cardinals 4-3 Boston Red Sox (best-of-seven) |
| 1968 | Detroit Tigers 4-3 St. Louis Cardinals (best-of-seven) |
| 1969 | New York Mets 4-1 Baltimore Orioles (best-of-seven) |
| 1970 | Baltimore Orioles 4-1 Cincinnati Reds (best-of-seven) |
| 1971 | Pittsburgh Pirates 4-3 Baltimore Orioles (best-of-seven) |
| 1972 | Oakland A’s 4-3 Cincinnati Reds (best-of-seven) |
| 1973 | Oakland A’s 4-3 New York Mets (best-of-seven) |
| 1974 | Oakland A’s 4-1 Los Angeles Dodgers (best-of-seven) |
| 1975 | Cincinnati Reds 4-3 Boston Red Sox (best-of-seven) |
| 1976 | Cincinnati Reds 4-0 New York Yankees (best-of-seven) |
| 1977 | New York Yankees 4-2 Los Angeles Dodgers (best-of-seven) |
| 1978 | New York Yankees 4-2 Los Angeles Dodgers (best-of-seven) |
| 1979 | Pittsburgh Pirates 4-3 Baltimore Orioles (best-of-seven) |
| 1980 | Philadelphia Phillies 4-2 Kansas City Royals (best-of-seven) |
| 1981 | Los Angeles Dodgers 4-2 New York Yankees (best-of-seven) |
| 1982 | St. Louis Cardinals 4-3 Milwaukee Brewers (best-of-seven) |
| 1983 | Baltimore Orioles 4-1 Philadelphia Phillies (best-of-seven) |
| 1984 | Detroit Tigers 4-1 San Diego Padres (best-of-seven) |
| 1985 | Kansas City Royals 4-3 St. Louis Cardinals (best-of-seven) |
| 1986 | New York Mets 4-3 Boston Red Sox (best-of-seven) |
| 1987 | Minnesota Twins 4-3 St. Louis Cardinals (best-of-seven) |
| 1988 | Los Angeles Dodgers 4-1 Oakland Athletics (best-of-seven) |
| 1989 | Oakland Athletics 4-0 San Francisco Giants (best-of-seven) |
| 1990 | Cincinnati Reds 4-0 Oakland Athletics (best-of-seven) |
| 1991 | Minnesota Twins 4-3 Atlanta Braves (best-of-seven) |
| 1992 | Toronto Blue Jays 4-2 Atlanta Braves (best-of-seven) |
| 1993 | Toronto Blue Jays 4-2 Philadelphia Phillies (best-of-seven) |
| 1994 | Not played |
| 1995 | Atlanta Braves 4-2 Cleveland Indians (best-of-seven) |
| 1996 | New York Yankees 4-2 Atlanta Braves (best-of-seven) |
| 1997 | Florida Marlins 4-3 Cleveland Indians (best-of-seven) |
| 1998 | New York Yankees 4-0 San Diego Padres (best-of-seven) |
| 1999 | New York Yankees 4-0 Atlanta Braves (best-of-seven) |
All-Star Games
| Season | All-Star Game | Venue |
| 1933 | American League 4-2 National League | Comiskey Park, Chicago |
| 1934 | American League 9-7 National League | Polo Grounds (1911), Manhattan, New York |
| 1935 | American League 4-1 National League | Cleveland Stadium, Cleveland |
| 1936 | National League 4-3 American League | Nickerson Field, Boston |
| 1937 | American League 8-3 National League | Griffith Stadium, Washington |
| 1938 | National League 4-1 American League | Crosley Field, Cincinnati |
| 1939 | American League 3-1 National League | Yankee Stadium (1923), Bronx, New York |
| 1940 | National League 4-0 American League | Sportsman’s Park (1909), St. Louis |
| 1941 | American League 7-5 National League | Tiger Stadium, Detroit |
| 1942 | American League 3-1 National League | Polo Grounds (1911), Manhattan, New York |
| 1943 | American League 5-3 National League | Shibe Park, Philadelphia |
| 1944 | National League 7-1 American League | Forbes Field, Pittsburgh |
| 1945 | Not played | Not played |
| 1946 | American League 12-0 National League | Fenway Park, Boston |
| 1947 | American League 2-1 National League | Wrigley Field, Chicago |
| 1948 | American League 5-2 National League | Sportsman’s Park (1909), St. Louis |
| 1949 | American League 11-7 National League | Ebbets Field, Brooklyn, New York |
| 1950 | National League 4-3 American League | Comiskey Park, Chicago |
| 1951 | National League 8-3 American League | Tiger Stadium, Detroit |
| 1952 | National League 3-2 American League | Shibe Park, Philadelphia |
| 1953 | National League 5-1 American League | Crosley Field, Cincinnati |
| 1954 | American League 11-9 National League | Cleveland Stadium, Cleveland |
| 1955 | National League 6-5 American League | Milwaukee County Stadium, Milwaukee |
| 1956 | National League 7-3 American League | Griffith Stadium, Washington |
| 1957 | American League 6-5 National League | Sportsman’s Park (1909), St. Louis |
| 1958 | American League 4-3 National League | Memorial Stadium, Baltimore |
| 1959 | National League 5-4 American League | Forbes Field, Pittsburgh |
| American League 5-3 National League | United Airlines Field at Los Angeles Memorial Coliseum, Los Angeles | |
| 1960 | National League 5-3 American League | Municipal Stadium (1955), Kansas City, Missouri |
| National League 6-0 American League | Yankee Stadium (1923), Bronx, New York | |
| 1961 | National League 5-4 American League | Candlestick Park, San Francisco |
| American League 1-1 (tie) National League | Fenway Park, Boston | |
| 1962 | National League 3-1 American League | Robert F. Kennedy Memorial Stadium, Washington |
| American League 9-4 National League | Wrigley Field, Chicago | |
| 1963 | National League 5-3 American League | Cleveland Stadium, Cleveland |
| 1964 | National League 7-4 American League | Shea Stadium, Queens, New York |
| 1965 | National League 6-5 American League | Metropolitan Stadium, Bloomington, Minnesota |
| 1966 | National League 2-1 American League | Busch Memorial Stadium, St. Louis |
| 1967 | National League 2-1 American League | Angel Stadium of Anaheim, Anaheim, California |
| 1968 | National League 1-0 American League | Astrodome, Houston |
| 1969 | National League 9-3 American League | Robert F. Kennedy Memorial Stadium, Washington |
| 1970 | National League 5-4 American League | Riverfront Stadium, Cincinnati |
| 1971 | American League 6-4 National League | Tiger Stadium, Detroit |
| 1972 | National League 4-3 American League | Atlanta-Fulton County Stadium, Atlanta |
| 1973 | National League 7-1 American League | Kauffman Stadium, Kansas City, Missouri |
| 1974 | National League 7-2 American League | Three Rivers Stadium, Pittsburgh |
| 1975 | National League 6-3 American League | Milwaukee County Stadium, Milwaukee |
| 1976 | National League 7-1 American League | Veterans Stadium, Philadelphia |
| 1977 | National League 7-5 American League | Yankee Stadium (1923), Bronx, New York |
| 1978 | National League 7-3 American League | San Diego Stadium, San Diego |
| 1979 | National League 7-6 American League | The Kingdome, Seattle |
| 1980 | National League 4-2 American League | Dodger Stadium, Los Angeles |
| 1981 | National League 5-4 American League | Cleveland Stadium, Cleveland |
| 1982 | National League 4-1 American League | Stade olympique, Montréal |
| 1983 | American League 13-3 National League | Comiskey Park, Chicago |
| 1984 | National League 3-1 American League | Candlestick Park, San Francisco |
| 1985 | National League 6-1 American League | Hubert H. Humphrey Metrodome, Minneapolis |
| 1986 | American League 3-2 National League | Astrodome, Houston |
| 1987 | National League 2-0 American League | Oakland-Alameda County Coliseum, Oakland, California |
| 1988 | American League 2-1 National League | Riverfront Stadium, Cincinnati |
| 1989 | American League 5-3 National League | Angel Stadium of Anaheim, Anaheim, California |
| 1990 | American League 2-0 National League | Wrigley Field, Chicago |
| 1991 | American League 4-2 National League | Rogers Centre, Old Toronto, Toronto |
| 1992 | American League 13-6 National League | San Diego Stadium, San Diego |
| 1993 | American League 9-3 National League | Oriole Park at Camden Yards, Baltimore |
| 1994 | National League 8-7 American League | Three Rivers Stadium, Pittsburgh |
| 1995 | National League 3-2 American League | Choctaw Stadium, Arlington, Texas |
| 1996 | National League 6-0 American League | Veterans Stadium, Philadelphia |
| 1997 | American League 3-1 National League | Progressive Field, Cleveland |
| 1998 | American League 13-8 National League | Coors Field, Denver |
| 1999 | American League 4-1 National League | Fenway Park, Boston |