Let H be a Hopf algebra over a field k. In this paper we present a general theory on partial H -radicals in the sense of Amitsur-Kurosh, for partial H -module algebras, as made in Fisher (J Algebra 34: [217][218][219][220][221][222][223][224][225][226][227][228][229][230][231] 1975) and Sidorov (Algebra i Logika 28 (6): [705][706][707][708][709][710][711][712][713][714][715][716][717][718][719][720][721] 1989) for global actions, and study some partial H -radicals of Jacobson type. Among other results we discuss some questions posed by Fisher (1975) in the context of partial actions.