This study examined the effects of E-marketing on customers’ patronage of commercial banks a study of Guaranty Trust Bank (GTBank) PLC, Lagos. The study adopted quantitative research design and the sources of data for this study were purely primary and secondary and a sample size of 385 customers of GTBank Plc, in Akoka area of Yaba Local Government, Lagos state were selected through a convenience sampling technique. The data were analyzed and descriptive statistics (mean and median), regression analysis and analysis of variance were used to provide answers to the research questions and test hypotheses. The study revealed that there is a direct nexus between the use of internet banking, and increase in customer patronage of GTBank, Plc, Lagos. Furthermore, a positive relationship was established between the use of USSD codes and quick service delivery of GTBank, Plc, Lagos. The study t...