‘Viability’ is a key term in debates about land reform in southern African and beyond, and is used in relation to both individual projects and programmes. ‘Viability’ connotes ‘successful’ and ‘sustainable’ – but what is meant by viability in relation to land reform, and how have particular conceptions of viability informed state policies and planning approaches? More broadly, how have different notions of viability influenced the politics of land in recent years? This paper interrogates this influential but under-examined notion, reflecting on debates about the viability of land reform – and in particular about the relevance of smallscale, farming-based livelihoods – in southern Africa and more broadly.