Washington Nationals franchise seasons

92 available seasons. Historical team names follow each season's source article.

• 2025 Washington Nationals — 53 roster players
• 2024 Washington Nationals — 50 roster players
• 2023 Washington Nationals — 48 roster players
• 2022 Washington Nationals — 55 roster players
• 2021 Washington Nationals — 60 roster players
• 2020 Washington Nationals — 43 roster players
• 2019 Washington Nationals — 50 roster players
• 2018 Washington Nationals — 53 roster players
• 2017 Washington Nationals — 49 roster players
• 2016 Washington Nationals — 43 roster players
• 2015 Washington Nationals — 44 roster players
• 2014 Washington Nationals — 40 roster players
• 2013 Washington Nationals — 44 roster players
• 2012 Washington Nationals — 43 roster players
• 2011 Washington Nationals — 44 roster players
• 2010 Washington Nationals — 46 roster players
• 2009 Washington Nationals — 55 roster players
• 2008 Washington Nationals — 50 roster players
• 2007 Washington Nationals — 46 roster players
• 2006 Washington Nationals — 56 roster players
• 2005 Washington Nationals — 55 roster players
• 1971 Washington Senators — 39 roster players
• 1970 Washington Senators — 40 roster players
• 1969 Washington Senators — 36 roster players
• 1968 Washington Senators — 39 roster players
• 1967 Washington Senators — 36 roster players
• 1966 Washington Senators — 42 roster players
• 1965 Washington Senators — 40 roster players
• 1964 Washington Senators — 37 roster players
• 1963 Washington Senators — 43 roster players
• 1962 Washington Senators — 36 roster players
• 1961 Washington Senators — 42 roster players
• 1960 Washington Senators — 37 roster players
• 1959 Washington Senators — 40 roster players
• 1958 Washington Senators — 39 roster players
• 1957 Washington Senators — 41 roster players
• 1956 Washington Senators — 33 roster players
• 1955 Washington Senators — 40 roster players
• 1954 Washington Senators — 32 roster players
• 1953 Washington Senators — 39 roster players
• 1952 Washington Senators — 43 roster players
• 1951 Washington Senators — 38 roster players
• 1950 Washington Senators — 41 roster players
• 1949 Washington Senators — 37 roster players
• 1948 Washington Senators — 35 roster players
• 1947 Washington Senators — 36 roster players
• 1946 Washington Senators — 36 roster players
• 1945 Washington Senators — 34 roster players
• 1944 Washington Senators — 37 roster players
• 1943 Washington Senators — 38 roster players
• 1942 Washington Senators — 36 roster players
• 1941 Washington Senators — 36 roster players
• 1940 Washington Senators — 35 roster players
• 1939 Washington Senators — 40 roster players
• 1938 Washington Senators — 28 roster players
• 1937 Washington Senators — 41 roster players
• 1936 Washington Senators — 35 roster players
• 1935 Washington Senators — 38 roster players
• 1934 Washington Senators — 39 roster players
• 1933 Washington Senators — 30 roster players
• 1932 Washington Senators — 30 roster players
• 1931 Washington Senators — 30 roster players
• 1930 Washington Senators — 36 roster players
• 1929 Washington Senators — 34 roster players
• 1928 Washington Senators — 33 roster players
• 1927 Washington Senators — 41 roster players
• 1926 Washington Senators — 35 roster players
• 1925 Washington Senators — 39 roster players
• 1924 Washington Senators — 35 roster players
• 1923 Washington Senators — 39 roster players
• 1922 Washington Senators — 32 roster players
• 1921 Washington Senators — 33 roster players
• 1920 Washington Senators — 40 roster players
• 1919 Washington Senators — 40 roster players
• 1918 Washington Senators — 30 roster players
• 1917 Washington Senators — 25 roster players
• 1916 Washington Senators — 31 roster players
• 1915 Washington Senators — 34 roster players
• 1914 Washington Senators — 33 roster players
• 1913 Washington Senators — 38 roster players
• 1912 Washington Senators — 41 roster players
• 1911 Washington Senators — 28 roster players
• 1910 Washington Senators — 30 roster players
• 1909 Washington Senators — 44 roster players
• 1908 Washington Senators — 25 roster players
• 1907 Washington Senators — 36 roster players
• 1906 Washington Senators — 28 roster players
• 1905 Washington Senators — 27 roster players
• 1904 Washington Senators — 27 roster players
• 1903 Washington Senators — 22 roster players
• 1902 Washington Senators — 19 roster players
• 1901 Washington Senators — 19 roster players