1965 | 32 Episodes

Season 1 of The F.B.I. premiered on September 19, 1965.

1966 | 29 Episodes

Season 2 of The F.B.I. premiered on September 18, 1966.

1967 | 27 Episodes

Season 3 of The F.B.I. premiered on September 17, 1967.

1968 | 26 Episodes

Season 4 of The F.B.I. premiered on September 22, 1968.

1969 | 26 Episodes

Season 5 of The F.B.I. premiered on September 14, 1969.

1970 | 26 Episodes

Season 6 of The F.B.I. premiered on September 20, 1970.

1971 | 26 Episodes

Season 7 of The F.B.I. premiered on September 12, 1971.

1972 | 26 Episodes

Season 8 of The F.B.I. premiered on September 17, 1972.

1973 | 23 Episodes

Season 9 of The F.B.I. premiered on September 16, 1973.