YR denotes reference in Yearly Reader page.
IHI denotes reference in It Happened In... pop-up.
L+N denotes refrence in Leaders+Numbers page.
TWT denotes reference in They Were There page.

IBM
YR: 1970s

Incaviligia, Pete
YR: 1996
IHI: 1987

Indianapolis Clowns (Negro Leagues)
YR: 1957

Indianapolis Hooisers (Federal league)
YR: 1914

Interleague Play
YR: 1903, 2000, 2002
IHI: 1997, 1998, 1999, 2006

Internal Revenue Service (IRS)
YR: 1989, 2007

International League
YR: 1918, 1928, 1938, 1947, 1948, 1967, 1975
IHI: 1946
TWT: 1941

Iorg, Duane
YR: 1985

Irabu, Hideki
YR: 1999
IHI: 1997

Iraq War
YR: 2005

Irvin, Monte
YR: 1950, 1951, 1952
L+N: 1951

Isbell, Frank
YR: 1906
IHI: 1908

Isringhausen, Jason
YR: 2006
L+N: 2000, 2004, 2007

Ivie, Mike
IHI: 1978