The purpose of this research was to study the influence of marketing mix on consumers' decision to choose a parcel shipping business of a private company in Thailand for consumers in Bangkok and its vicinities. The instrument used in this study was a questionnaire-based survey online through Google Form. The sample group consists of 400 users from. The statistical data analyzed were descriptive statistics using frequency, percentage and inferential statistics using T-test, F-test (One-way ANOVA) and Multiple Regression Analysis. The results showed that the factors of marketing mix Influence on the decision to use the parcel shipping business of private companies in Thailand of consumers in Bangkok and its vicinities statistically significant at the level of 0.05