Lisa Loring
She played Wednesday in the very first "The Addams Family" TV series (1964-1966). That original black-and-white one. So for many viewers, Lisa Loring's portrayal remains the definitive version – after all, she was the first.
Source:
IMDb

Source:
IMdb
Christina Ricci
She played Wednesday in "The Addams Family" (1991) and "Addams Family Values" (1993). Her version became iconic for an entire generation – Ricci perfectly captured the gothic humor and dark charm of the character with an absolutely deadpan expression. The summer camp scenes where Wednesday gives her tormentors a taste of their own medicine were particularly memorable.
Source:
IMDb

Source:
IMDb
Nicole Fugere
Nicole Fugere played Wednesday Addams in the 1998 TV movie "Addams Family Reunion," an attempt to reboot the 1991 film as a live-action sitcom.
Source:
IMDb
Jenna Ortega
She played Wednesday in Tim Burton's series "Wednesday," which premiered on Netflix in 2022. In this project, the Addams family heir takes center stage, while her relatives remain in supporting roles.
Source:
IMDb
The series caused a sensation, and the scene with Wednesday's dance at the school ball went viral. Each actress brought something unique to the role, but all preserved Wednesday's key traits: dark sarcasm, intelligence, fearlessness, and that special "gothic princess" charm.