Daniel Francis O'Connell (January 21, 1929 – October 2, 1969) was an American infielder in Major League Baseball for the Pittsburgh Pirates (1950; 1953), Milwaukee Braves (1954–57), New York/San Francisco Giants (1957–59) and Washington Senators (1961–62).

As a member of the San Francisco Giants, O'Connell scored the first run in the first big-league baseball game played on the West Coast on April 15, 1958.

Then, at the trading deadline, the Braves sent O'Connell to the New York Giants, along with outfielder Bobby Thomson and pitcher Ray Crone, for standout veteran second baseman Red Schoendienst, who helped lead Milwaukee to the 1957 World Series title.

Signed as a free agent by the 1961–71 edition of the Senators, just created as an expansion team, he played in that franchise's first regular season game, on April 10, 1961 at Griffith Stadium in the traditional Presidential opener.

O'Connell, who was residing in Bloomfield, New Jersey, died on October 2, 1969, in nearby Clifton at the age of 40 from a heart attack while driving his Ford which then crashed into a utility pole.