thumbnail|Ivan Vidav in 1963
Ivan Vidav (January 17, 1918 – October 6, 2015) was a Slovenian mathematician.
Ivan Vidav was born in Villa Opicina near Trieste, Italy. He was a student of Josip Plemelj.
Vidav's main research interest were differential equations, functional analysis, and algebra. He was a regular member of the Slovenian Academy of Sciences and Arts. He received the Prešeren Award in recognition of his work.