Pittsburgh Pirates franchise seasons
125 available seasons. Historical team names follow each season's source article.
- 2025 Pittsburgh Pirates — 57 roster players
- 2024 Pittsburgh Pirates — 56 roster players
- 2023 Pittsburgh Pirates — 59 roster players
- 2022 Pittsburgh Pirates — 68 roster players
- 2021 Pittsburgh Pirates — 64 roster players
- 2020 Pittsburgh Pirates — 49 roster players
- 2019 Pittsburgh Pirates — 54 roster players
- 2018 Pittsburgh Pirates — 48 roster players
- 2017 Pittsburgh Pirates — 47 roster players
- 2016 Pittsburgh Pirates — 55 roster players
- 2015 Pittsburgh Pirates — 46 roster players
- 2014 Pittsburgh Pirates — 45 roster players
- 2013 Pittsburgh Pirates — 49 roster players
- 2012 Pittsburgh Pirates — 49 roster players
- 2011 Pittsburgh Pirates — 52 roster players
- 2010 Pittsburgh Pirates — 52 roster players
- 2009 Pittsburgh Pirates — 49 roster players
- 2008 Pittsburgh Pirates — 47 roster players
- 2007 Pittsburgh Pirates — 45 roster players
- 2006 Pittsburgh Pirates — 42 roster players
- 2005 Pittsburgh Pirates — 43 roster players
- 2004 Pittsburgh Pirates — 43 roster players
- 2003 Pittsburgh Pirates — 46 roster players
- 2002 Pittsburgh Pirates — 38 roster players
- 2001 Pittsburgh Pirates — 49 roster players
- 2000 Pittsburgh Pirates — 46 roster players
- 1999 Pittsburgh Pirates — 45 roster players
- 1998 Pittsburgh Pirates — 38 roster players
- 1997 Pittsburgh Pirates — 43 roster players
- 1996 Pittsburgh Pirates — 47 roster players
- 1995 Pittsburgh Pirates — 40 roster players
- 1994 Pittsburgh Pirates — 39 roster players
- 1993 Pittsburgh Pirates — 47 roster players
- 1992 Pittsburgh Pirates — 43 roster players
- 1991 Pittsburgh Pirates — 43 roster players
- 1990 Pittsburgh Pirates — 46 roster players
- 1989 Pittsburgh Pirates — 45 roster players
- 1988 Pittsburgh Pirates — 41 roster players
- 1987 Pittsburgh Pirates — 49 roster players
- 1986 Pittsburgh Pirates — 40 roster players
- 1985 Pittsburgh Pirates — 43 roster players
- 1984 Pittsburgh Pirates — 37 roster players
- 1983 Pittsburgh Pirates — 38 roster players
- 1982 Pittsburgh Pirates — 43 roster players
- 1981 Pittsburgh Pirates — 37 roster players
- 1980 Pittsburgh Pirates — 37 roster players
- 1979 Pittsburgh Pirates — 34 roster players
- 1978 Pittsburgh Pirates — 37 roster players
- 1977 Pittsburgh Pirates — 36 roster players
- 1976 Pittsburgh Pirates — 31 roster players
- 1975 Pittsburgh Pirates — 34 roster players
- 1974 Pittsburgh Pirates — 39 roster players
- 1973 Pittsburgh Pirates — 36 roster players
- 1972 Pittsburgh Pirates — 33 roster players
- 1971 Pittsburgh Pirates — 35 roster players
- 1970 Pittsburgh Pirates — 39 roster players
- 1969 Pittsburgh Pirates — 35 roster players
- 1968 Pittsburgh Pirates — 33 roster players
- 1967 Pittsburgh Pirates — 34 roster players
- 1966 Pittsburgh Pirates — 32 roster players
- 1965 Pittsburgh Pirates — 33 roster players
- 1964 Pittsburgh Pirates — 35 roster players
- 1963 Pittsburgh Pirates — 33 roster players
- 1962 Pittsburgh Pirates — 36 roster players
- 1961 Pittsburgh Pirates — 37 roster players
- 1960 Pittsburgh Pirates — 37 roster players
- 1959 Pittsburgh Pirates — 37 roster players
- 1958 Pittsburgh Pirates — 36 roster players
- 1957 Pittsburgh Pirates — 40 roster players
- 1956 Pittsburgh Pirates — 42 roster players
- 1955 Pittsburgh Pirates — 42 roster players
- 1954 Pittsburgh Pirates — 37 roster players
- 1953 Pittsburgh Pirates — 44 roster players
- 1952 Pittsburgh Pirates — 45 roster players
- 1951 Pittsburgh Pirates — 45 roster players
- 1950 Pittsburgh Pirates — 40 roster players
- 1949 Pittsburgh Pirates — 37 roster players
- 1948 Pittsburgh Pirates — 33 roster players
- 1947 Pittsburgh Pirates — 42 roster players
- 1946 Pittsburgh Pirates — 43 roster players
- 1945 Pittsburgh Pirates — 32 roster players
- 1944 Pittsburgh Pirates — 33 roster players
- 1943 Pittsburgh Pirates — 32 roster players
- 1942 Pittsburgh Pirates — 35 roster players
- 1941 Pittsburgh Pirates — 38 roster players
- 1940 Pittsburgh Pirates — 36 roster players
- 1939 Pittsburgh Pirates — 36 roster players
- 1938 Pittsburgh Pirates — 25 roster players
- 1937 Pittsburgh Pirates — 26 roster players
- 1936 Pittsburgh Pirates — 26 roster players
- 1935 Pittsburgh Pirates — 29 roster players
- 1934 Pittsburgh Pirates — 30 roster players
- 1933 Pittsburgh Pirates — 28 roster players
- 1932 Pittsburgh Pirates — 27 roster players
- 1931 Pittsburgh Pirates — 32 roster players
- 1930 Pittsburgh Pirates — 34 roster players
- 1929 Pittsburgh Pirates — 35 roster players
- 1928 Pittsburgh Pirates — 35 roster players
- 1927 Pittsburgh Pirates — 33 roster players
- 1926 Pittsburgh Pirates — 35 roster players
- 1925 Pittsburgh Pirates — 28 roster players
- 1924 Pittsburgh Pirates — 30 roster players
- 1923 Pittsburgh Pirates — 31 roster players
- 1922 Pittsburgh Pirates — 34 roster players
- 1921 Pittsburgh Pirates — 33 roster players
- 1920 Pittsburgh Pirates — 32 roster players
- 1919 Pittsburgh Pirates — 30 roster players
- 1918 Pittsburgh Pirates — 33 roster players
- 1917 Pittsburgh Pirates — 41 roster players
- 1916 Pittsburgh Pirates — 45 roster players
- 1915 Pittsburgh Pirates — 34 roster players
- 1914 Pittsburgh Pirates — 41 roster players
- 1913 Pittsburgh Pirates — 37 roster players
- 1912 Pittsburgh Pirates — 38 roster players
- 1911 Pittsburgh Pirates — 33 roster players
- 1910 Pittsburgh Pirates — 33 roster players
- 1909 Pittsburgh Pirates — 29 roster players
- 1908 Pittsburgh Pirates — 32 roster players
- 1907 Pittsburgh Pirates — 32 roster players
- 1906 Pittsburgh Pirates — 32 roster players
- 1905 Pittsburgh Pirates — 28 roster players
- 1904 Pittsburgh Pirates — 33 roster players
- 1903 Pittsburgh Pirates — 32 roster players
- 1902 Pittsburgh Pirates — 27 roster players
- 1901 Pittsburgh Pirates — 27 roster players