The rapid growth of e-commerce has increased the importance of logistics services as a critical factor influencing consumer decision-making. This study aims to analyze the effect of service quality on consumer decisions in using Shopee Express (SPX) delivery services in Binjai Selatan. A quantitative approach with a causal research design was employed. Data were collected from 100 respondents who had previously used SPX services through a structured questionnaire measured using a Likert scale. T