John Megna (November 9, 1952 - September 5, 1995) was an American actor whose Broadway success at the age of seven in 1960's All the Way Home led to his being cast as Charles Baker 'Dill' Harris, the toothy young summer visitor in the 1962 film To Kill a Mockingbird. According to Mockingbird author, Harper Lee, the character was based on her childhood friend, writer Truman Capote.

A half-brother of actress/singer/businesswoman Connie Stevens, Megna appeared in many television programs throughout the 1960s and 1970s, and as an adult, had turned to stage directing. On September 5, 1995, in Los Angeles, California, he died from AIDS-related complications at the age of 42.

John Megna's other acting credits include: The Mogul (1984); The Cannonball Run (1981); Smokey and the Bandit II (1980); Skag (1980) (TV); Go Tell the Spartans (1978); I Want to Keep My Baby (1976) (TV); The Boy in the Plastic Bubble (1976) (TV); The Godfather: Part II (1974) (uncredited in the role of Young Hyman Roth); Star Trek (1966) (TV); Blindfold (1965); and Hush... Hush, Sweet Charlotte (1964).