This study examines the effect of brand loyalty on consumer buying behavior in the Ethiopian soap and detergent market. Brand loyalty is defined as consumers’ continued preference for a specific brand, while buying behavior is reflected through purchase intention and willingness to pay a premium price. The study adopts a quantitative, cross-sectional design based on survey data from 419 consumers across selected cities in Ethiopia. The results confirm reliable measurement (α = 0.844 for brand loyalty; α = 0.800 for buying behavior) and reveal moderate levels of loyalty and purchase intention, alongside lower willingness to pay a premium price. Correlation analysis shows a strong and significant relationship between brand loyalty and buying behavior (r = 0.702, p < 0.01). Regression results indicate that brand loyalty has a positive and significant effect (β = 0.702, p < 0.001), explaining 49.3% of the variance. The findings highlight the role of brand loyalty in shaping consumer behavior while indicating the continued influence of price sensitivity in the Ethiopian FMCG market.