A list of the antagonists in the series.
- Main Villain: Mona Vanderwaal
- Secondary Villains: Melissa Hastings, Jenna Marshall, and Garrett Reynolds
- Main Villain: CeCe Drake and Sara Harvey
- Secondary Villains: Jessica DiLaurentis, Shana Fring and Ezra Fitz
- Main Villain: CeCe Drake and Alison DiLaurentis
- Secondary Villains: Mona Vanderwaal, Mona's Army, and Ali's Army