Transformational leadership has been proposed as an approach that can inspire effective change. How this is manifest in schools is understudied in Irish primary schools, which have undergone significant change in recent years. The focus of this qualitative research study was primary school and system leaders’ knowledge of transformational school leadership, perceived benefits, limitations, and feasibility, and how transformational school leadership actually manifests in practice. Participants were recruited using purposive sampling. In-depth interviews were carried out with principals, deputy and assistant principals, and former school inspectors, with the interviews aligned to the following research questions: (1) How can we characterize school and system leaders’ knowledge, understanding and perceptions regarding the feasibility of transformational school leadership? (2) How do transformational school-leadership behaviours manifest in primary-school settings? Data analysis yielded the following themes and sub-themes: (1) Understanding of transformational school leadership: (i) transformation, change and growth, (ii) relationships, (iii) vision, mission, and goals, (iv) leading; (2) Perceptions of feasibility of transformational school leadership: (i) realism, (ii) people and relationships, (iii) practical challenges; (3) Benefits of transformational school leadership: (i) aspiration, (ii) culture, (iii) motivation and modelling, (iv) school community, (v) delivering quality learning; (4) Limitations of transformational school leadership: (i) personality, (ii) pressure, (iii) slow process, (iv) unexpected variables; (5) Manifestations of transformational school-leadership: (i) idealised influence, (ii) inspirational motivation, (iii) individualised consideration, (iv) intellectual stimulation, (v) school development, (vi) improving curricular offerings. Participants’ positive disposition to transformational school leadership was encouraging and suggests the need for further research, specifically to examine potential synergies between transformational and distributed school leadership.