The first season of Hawaii Five-O, an American television series, began September 20, 1968, and ended on March 19, 1969. It aired on CBS. The region 1 DVD was released on March 6, 2007.

The second season of Hawaii Five-O, an American television series, began September 24, 1969, and ended on March 11, 1970. It aired on CBS. The region 1 DVD was released on July 31, 2007.

The third season of Hawaii Five-O, an American television series, began September 16, 1970, and ended on March 10, 1971. It aired on CBS. The region 1 DVD was released on January 22, 2008.

The fourth season of Hawaii Five-O, an American television series, began September 14, 1971, and ended on March 7, 1972. It aired on CBS. The region 1 DVD was released on June 10, 2008.

The fifth season of Hawaii Five-O premiered on September 12, 1972 and ended March 13, 1973. 24 episodes aired during this season. The Region 1 DVD was released on November 18, 2008.

The sixth season of Hawaii Five-O premiered on September 11, 1973 and ended February 26, 1974. 24 episodes aired during this season. The Region 1 DVD was released on April 21, 2009. Creator and executive producer Leonard Freeman died during this season.