The evangelical revival of 1859 remains a pivotal event in the religious culture of Ulster Protestants owing to its legacy of widespread conversion, church renewal, and its role in shaping the pan-Protestantism of Ulster society that later opposed Irish home rule. Being part of a wider transatlantic movement of religious awakening, the 1859 revival was seen as the culmination of thirty years of evangelical renewal within Irish Presbyterianism. What has often been overlooked, however, is the fact that many aspects of the revival were deeply troubling to orthodox Presbyterians. Although most Ulster Presbyterians were largely supportive of the movement, an intellectually significant minority dissented from what they saw as its spectacular, doctrinal, liturgical, ecclesiological, and moral aberrations. Given 1859’s mythological status among Ulster evangelicals, it is normally assumed that all who opposed the revival were either religious formalists or those of heterodox doctrinal opinions. It will be argued that such an assumption is deeply misguided, and that the Presbyterian opponents of 1859 were motivated by zeal for confessional Reformed theology and Presbyterian church-order. By focusing on theologically conservative opposition to an ostensible evangelical and Calvinistic awakening, this article represents a significant contribution to the existing historiography of not only the Ulster revival but of religious revivalism more generally. It also helps us to understand the long-term evolution of Ulster Presbyterian belief and practice in the late nineteenth and twentieth centuries.