圭多·富比尼（Guido Fubini，1879年1月19日—1943年6月6日）是意大利数学家，最著名是他的富比尼定理。

富比尼生于威尼斯。早年即因他的老师们和他作数学老师的父亲影响而醉心数学。1896年他进了Scuola Normale Superiore di Pisa，跟随著名数学家乌利塞·迪尼和路易吉·比安基学习。他早时已经有点名声，他1900年发表的博士论文《椭圆空间中的克利福德平行》，在比安基广泛流传的微分几何著作中作了讨论。

他获得博士后，开始担任一连串的教授职位。1901年他在西西里的卡塔尼亚大学开始教学，不久后转到热那亚大学；1908年转到都灵的Politecnico，接着在都灵大学。他留在这里数十年。

Guido Fubini (19 January 1879 – 6 June 1943) was an Italian mathematician, known for Fubini's theorem and the Fubini–Study metric.

Born in Venice, he was steered towards mathematics at an early age by his teachers and his father, who was himself a teacher of mathematics. In 1896 he entered the Scuola Normale Superiore di Pisa, where he studied under the notable mathematicians Ulisse Dini and Luigi Bianchi. He gained some early fame when his 1900 doctoral thesis, entitled Clifford's parallelism in elliptic spaces, was discussed in a widely read work on differential geometry published by Bianchi in 1902.