Oliver Nicholas Day (born June 23, 1997) is an American actor based in Southern California. He began his acting journey at nine years old, landing auditions for national commercials and discovering his passion for on-screen performance.

Day has been featured in popular television series and streaming originals, including Santa Clarita Diet (2017), Ryan Murphy's 9-1-1 (2018), and Side Hustle (2020). His work spans platforms like Netflix, Hulu, Nickelodeon, and YouTube Premium, with credits in shows such as The Politician (2019), Foursome (2018), No Good Nick (2019), and the reboot of All That (2020).

Dedicated to honing his craft, Day continues to build his presence in the industry, seeking dynamic roles that challenge and inspire him.