One of Us Is Lying is an American teen drama mystery television series developed by Erica Saleh. The series is based on the 2017 novel of the same name by Karen M. McManus and follows five high school students who enter detention, where one of them dies under suspicious circumstances and an investigation ensues. It stars Mark McKenna as Simon, the deceased student, and Annalisa Cochrane, Chibuikem Uche, Marianly Tejada, and Cooper van Grootel as the main suspects, with Barrett Carnahan, Jessica McLeod, and Melissa Collazo, Sara Thompson and Alimi Ballard in supporting roles.

The series premiered on Peacock on October 7, 2021, and was met with generally positive reviews from critics. In January 2022, the series was renewed for a second season which premiered on October 20, 2022. In January 2023, the series was canceled after two seasons.