Tillie Walden is an American cartoonist known for her work in graphic novels and webcomics. Born in 1996 in San Diego, California, she has made significant strides in the field of comics at a young age. Walden graduated from the Center for Cartoon Studies in Vermont, where she is now a professor.

Walden began publishing short comics as a teenager. Her first long-form graphic novel, The End of Summer, was published in 2015 by the British publisher Avery Hill. Shortly after, her second book, I Love This Part, won the 2016 Ignatz Award for promising new talent.

Among her notable works is Spinning (2017), which won the 2018 Eisner Award for Best Reality-Based Work, making her one of the youngest Eisner Award winners. Other works include A City Inside (2016), On a Sunbeam (2018), Are You Listening? (2020), Alone in Space (2021), and the series Clementine.

In 2023, Walden was appointed as Vermont's cartoonist laureate for 2023-2026, marking her as the state's youngest-ever cartoonist laureate.