Men are increasingly participating, and acknowledging their roles, as informal carers. Yet, there has been comparatively little exploration of their experiences therein, especially within the context of cancer care. Here, drawing on semi-structured qualitative interviews with 16 Australian male carers for a relative with cancer, and using constructivist grounded theory, we explore their experiences of informal caring. Our analysis highlights a series of tensions, including the following: the meanings and practicalities of care provision including notions of reciprocity, duty, autonomy, and interdependence; the discomforts of dependency and vulnerability; and the complicated moralities that inflect “caring well.” Given the shifting dynamics around informal care, we argue for increased attention to the affective tensions that arise at the nexus of moralities and masculinities in informal caring relations, especially as they are articulated in the context of illness, affliction, and dependency.