This research aimed to study the online marketing communication of restaurant businesses in Chanthaburi Province, to find the relationship between the online marketing communication of restaurant businesses in Chanthaburi and other variables - personal data variables, type of business, and the size of the business. The businesses used 5 marketing communication tools: online advertising, online publicity, online promotion, online personal sales, and direct online marketing. This was quantitative research. Data were collected from a group of 400 representatives of restaurant businesses in Chanthaburi Province by using a convenient random sampling method. The statistics used in data analyzses were frequency distribution, percentage, mean, standard deviation, F-test, One-Way ANOVA, comparing differences using Scheffe’s method, and Pearson correlation coefficient analysis. The results showed that the online marketing communication of restaurant businesses in Chanthaburi Province was at the highest level. The averages of online advertising, online
publicity, online promotion, online personal sales, and online direct marketing were at the highest level in all aspects. Personal factors, type of restaurant business, and size of restaurant business correlated with online marketing communication of restaurant businesses in Chanthaburi in every aspect at the significance level of 0.05. The results of this research can be used to plan online marketing campaigns for restaurant businesses and lead to the development of online media for use by all stakeholders to benefit the local community, entrepreneurs and the nation.