There are 8 mathematicians whose last name begin with ORB.

Orbach, Raymond University of California, Berkeley 1960
Ørbæk, Peter Aarhus University 1997
Orban, Dominique Université de Namur 2001
Orbanič, Alen University of Ljubljana 2006
Orbe, Clara Columbia University 2013
Orbe, Susan Universidad del País Vasco 2000
Orbegozo Rodriguez, Miguel University of Glasgow 2023
Orbell, John The University of North Carolina at Chapel Hill 1965