Gestronol (), also known as gestonorone, as well as 17ñ-hydroxy-19-norprogesterone or 17ñ-hydroxy-19-norpregn-4-ene-3,20-dione, is a progestin of the 19-norprogesterone and 17ñ-hydroxyprogesterone groups which was never marketed. The C17ñ caproate ester of gestronol, gestonorone caproate (gestronol hexanoate), in contrast, has been marketed.
Gestronol shows relatively low affinity for the progesterone receptor, only about 12.5% of that of progesterone and about 2.5% of that of 19-norprogesterone in one assay. On the other hand, gestronol had far higher affinity than 17ñ-hydroxyprogesterone, which showed less than 0.1% of the affinity of progesterone for the progesterone receptor.