This study aims to determine the effect of Relationship Marketing to Customer Retention at Bank BNI Branch Office Jakarta City. The population of this study is all customers of Bank BNI KC. JAKARTA CITY during the study period. The sample of this study amounted to 57 customers taken using incidental sampling technique. This research used associative quantitative research method. After the data have the same characteristics and normal distribution based on the normality and homogeneity test, followed by analysis of variance (ANAVA). Based on the result of linear regression calculation obtained Ŷ = 34,57 + 0,73 (x) and result of calculation of ANAVA got Fhitung <Ftabel that is -2286,165 <4,04. Hypothesis testing is done by calculating Pearson Product Moment correlation and in can rxy = 0,734, it shows influence of Relationship Marketing to Customer Retention at Bank BNI KC. Jakarta City is Strong in accordance with the interpretation criteria in Table Interpretation of Correlation Coefficients. Therefore, the results of this study can be concluded that there is influence between Relationship Marketing Against Customer Retention at Bank BNI Branch Office Jakarta Kota.