Elizabeth Shaila Koshy (born March 31, 1996) is an American YouTuber, media personality and actress. Her main channel has amassed almost 17 million subscribers, and her two channels have over 3 billion views combined. She has received four Streamy Awards, four Teen Choice Awards, and a Kids' Choice Award.

Koshy began her career on Vine in 2013 before starting a YouTube channel. She made her acting debut as Aday Walker in Tyler Perry's horror comedy film Boo! A Madea Halloween (2016). She went on to star as Violet Adams in the horror drama series Freakish (2016–2017) and The Explorer in the YouTube Premium mystery series Escape the Night (2017–2019). She was also a correspondent for the MTV television series Total Request Live (2017–2018).

Koshy co-created, produced and starred as the title character in the YouTube Premium comedy series Liza on Demand (2018–2021), which earned her several accolades, and hosted the Nickelodeon game show revival Double Dare(2018–2019), for which she received a Daytime Emmy Award nomination. She starred in the Netflix dance comedy film Work It (2020). She had voice roles in the animated adventure film My Little Pony: A New Generation (2021) and the science fiction film Transformers: Rise of the Beasts (2023).

Koshy was included in the 2019 Forbes 30 Under 30 Hollywood & Entertainment list, the Time 2019 list of the 25 Most Influential People on the Internet and its 100 Next list that same year.

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