The current approaches to the Tagalog focus system attach too much importance to syntactic transitivity, and leave unanswered the question of how the focus system correlates with voice phenomena, thereby failing to elucidate its functional aspects. In this paper, we address this question by examining the middle voice and related voice phenomena in this language. Adopting the conceptual framework for voice phenomena (Shibatani 2006), we claim that Goal Focus (GF) verb forms express active situations, whereas Actor Focus (AF) verb forms represent two different non-active situations, namely, middle situations with introverted verbs and antipassive situations with extroverted verbs. AF verb forms also work for actor nominalization. We argue that these two functions of AF verb forms, non-active voice categories and actor nominalization, stem from their primary function, namely, actor-focusing.