Paul Ian Biran (Hebrew: פאול בירן; born 25 February 1969) is an Israeli mathematician.

[1] Born in Romania in 1969, Biran's family moved to Israel in 1971.

He attended Tel Aviv University, where he earned his Bachelor's degree in 1994 and Ph.D. in 1997[1] under supervision of Leonid Polterovich (thesis: Geometry of Symplectic Packing).

From 1997 to 1999, Biran was a "Szego Assistant Professor" at Stanford University.

In 2009, Biran became a full professor of mathematics at ETH Zurich.