Dennis J. Patrick O'Grady (December 9, 1943 – March 29, 1972) was an American politician in the state of Florida.
A Republican, he was the youngest person elected to the Florida State Senate.
He won his seat at age 23 in a court-ordered election on March 28, 1967, to represent the 15th[1] District and served until 1968.
He was born in Brooklyn, New York, and had worked as a building contractor and nurseryman.
[2] On March 29, 1972, O'Grady died in a car crash at the age of 28.