List of Famous people born on March 31st

Xavier Ros Oton is a Spanish mathematician who works on partial differential equations (PDEs). He is an ICREA Research Professor and a Full Professor at the University of Barcelona.

Patrick O'Moore (1909–1983) was an Irish actor who appeared in a variety of American films and television shows. A character actor, he appeared in a number of Hollywood's British-themed films during the 1940s and 1950s.

Sergei Anatolyevich Karev is a Russian retired pair skater. With former partner Arina Ushakova, he is the 2005 Golden Spin of Zagreb silver medalist and 2007 Winter Universiade bronze medalist. They placed 5th at the 2008 European Championships.

Ashleigh Adele Ball is a Canadian voice actress and musician, known for singing in the rock band Hey Ocean!, as well as voicing characters in several toyetic movies and television series, notably the Barbie film series, Bratz, Johnny Test, Littlest Pet Shop, and My Little Pony: Friendship Is Magic. She is the subject of the documentary A Brony Tale directed by Brent Hodge, which follows her through her first interactions with the brony community at BronyCon 2012.

Jermone Gregory Finn, sometimes credited as "Huckle" Jerry Finn, was an American record producer, mix engineer, and musician. He worked with numerous punk rock and pop-punk artists, such as Blink-182, AFI, Sum 41, Alkaline Trio, Green Day, Morrissey, MxPx, and Rancid. Finn was known for the warm guitar tone present on albums he produced, as well as the "punchy" sound of his mixes. He was instrumental in developing the polished sound of pop-punk in its second wave of popularity between the mid-1990s and early 2000s.

Johann Friedrich Theodor Müller, better known as Fritz Müller, and also as Müller-Desterro, was a German biologist who emigrated to southern Brazil, where he lived in and near the German community of Blumenau, Santa Catarina. There he studied the natural history of the Atlantic forest south of São Paulo, and was an early advocate of Darwinism. He lived in Brazil for the rest of his life. Müllerian mimicry is named after him.