This dissertation is presented as a contribution to the study of the History and Theology of Argentine Pentecostalism. Attention is given to the social, political and religious context in which the events have taken place and the tendencies deriving from them are examined. The work is divided into three parts. In Part I, the study of the origin and development of Pentecostalism shows the correlation between the historical process and the distinctive features of Argentine society. At the same time the non-denominational and independent origin of the movement is established. Part II provides examples of ministry and predominant theological emphases. Special attention is given to elements that form the pastoral profile, theological education and the ministry of women. In the theological field, besides analysing the development of doctrines common to Pentecostalism, such as baptism in the Holy Spirit and divine healing, the decisive influence of the Latter Rains Movement is underlined. Three models of evangelism which have affected Pentecostal theology and practice are examined. Part III concentrates on movements towards unity and the way in which churches linked to missionary bodies have blocked this process as a result of ideological pressure from their denominational headquarters. The investigation closes with indications of some of the hazards and prospects to which the largest denomination in Argentina and Latin America is exposed.