Elizabeth Shaila Koshy is an American actress, television host, comedian and YouTuber. She began her career on Vine in 2013, before starting a YouTube channel.

Among her acting roles have been Aday Walker in Tyler Perry's horror comedy film Boo! A Madea Halloween (2016) and The Explorer in the YouTube Premium series Escape the Night (2017). She starred as Violet Adams in the Hulu drama television series Freakish (2016–2017). From 2017 to 2018, she was a contributor to the MTV television series Total Request Live. Since 2018, Koshy has produced and starred as the title character in the YouTube Premium comedy series Liza on Demand. From 2018 to 2019, she hosted the Nickelodeon game show revival Double Dare, for which she received an Emmy Award nomination. In 2020, she starred in the Netflix dance-comedy film Work It.