1984 (MCMLXXXIV) was a leap year starting on Sunday.
| Date | Event(s) | |
|---|---|---|
| Unknown date | The Intertidal Zone was drawn by Stephen Hillenburg. | |
| May 14 | Birth of Daniel Dominguez. | |
| June 26 | Birth of Aubrey Plaza, the voice of Nocturna. | |
| July 28 | Birth of Emily Merl, the production coordinator of SpongeBob SquarePants. | |
| September 27 | Birth of Avril Lavigne. | |
| November 9 | Birth of Andrew Goodman. | |
| November 22 | Birth of Scarlett Johansson, the voice of Princess Mindy. | |
| December 30 | Birth of LeBron James, guest star in "Truth or Square." | |