Abstract:
This study aims to analyze the influence of service 
quality on customer loyalty  at  PT. BNI (Persero), Tbk USU 
Medan. This study used  a quantitative approach with an 
explanatory type of research. The sample were 120 respondents 
and processed statistically using simple linear regression method. 
The results show that service quality positively  has a significant 
effect on customer loyalty.  These findings indicate that good 
service quality will encourage the interest of customers to conduct 
transactions continuously and repeatedly in the present and future 
in a bank.  
 
Index Terms—Service quality, customer loyalty, banking, 
BNI.