Madilyn Bailey Wold (born September 2, 1992), commonly known as Madilyn Bailey and Madilyn, is an American singer, songwriter, musician, and YouTube personality. She has appeared on multiple TV live shows in France to promote her cover singles and she also promoted her original single "Tetris" on the American TV show Today in 2018. As of February 2024, she has about 9.6 million subscribers on YouTube.

Her debut original EP Bad Habit was released in 2012. She released her first studio album Muse Box in 2015 through PlayOn/Warner Music France. Her second original EP, Wiser, was released independently in July 2016.

She held her first headlining show in Paris in 2018 and her first headlining full-band tour in China in 2019; she has also toured in the US and Canada twice with Boyce Avenue as a special guest.