Augustine’s preaching touches numerous aspects of his theology which are predominantly present in his most important treatises. The sacraments of the Church are treated in his controversies with heretics but they are also very much present in his sermons, where he teaches the sound doctrine of the Church and performs the Christian rites for the edification of the faithful. This chapter examines Augustine’s teaching on baptism and the Eucharist in his preaching. Having considered his definition of the sacraments in general in his preached works, it presents his teaching on the sacraments in his catechesis to the baptism candidates and to the newly baptised Christians of his congregation. The study further takes into consideration what Augustine says on baptism and the Eucharist in his sermons while addressing the problems of the Donatists and Pelagians. Augustine makes difficult theological concepts understandable to his flock by adapting his language to them.