PAR1

PAR1 may refer to:
 * PAR1 (gene), Prader–Willi/Angelman region-1 gene
 * PAR-1, a serine/threonine-protein kinase of the KIN2/PAR-1/MARK kinase family
 * Coagulation factor II receptor
 * Parchive, a data archive format
 * PAR1, one of the pseudoautosomal regions of the X or Y chromosome