Alonzo Sheck "Shack" Shealy (June 1, 1873 – October 24, 1929) was an American college football player and coach.

His father, J. Edward Shealy, was a well-to-do planter of Edgefield, his mother was Miss Frances Linder, of Lexington.

Shealy attended public schools of this County until February 1894, when he enrolled at Clemson Agricultural College of South Carolina, in June 1894; graduated 1899 with a Bachelor of Science degree.

He has been honored with the highest office in the corps, being appointed Senior Captain in February 1898.

He was hired in the fall of 1904 to replace Coach John Heisman who had accepted Georgia Tech's offer to become head of athletics at the institute in November 1903.