Abstarct: Word-of-mouth advertising, as a non-commercial and informal communication, has always had a high position in sports marketing, and the factors affecting it are very important for the promotion of such advertisements among sports consumers. Therefore, this research aims to conduct a mexta-analysis of the effective factors on word-of-mouth advertising in sports. The mexta-analysis method was used to conduct this research. The statistical population in this research is made up of all articles and theses published on factors affecting word-of-mouth advertising in sports between 2002 and 2022 in sixteen databaxses and two search engines. Finally, 41 articles were selected as a purposive sampling. The data collection tool included the mexta-analysis document prepared by the researcher. Data were analyzed by using CMA2 software; Also, according to the q-value, I-squared, and tau-squared tests, the heterogeneity of the studies was determined. The results showed that the effect sizes of satisfaction, loyalty, and trust as the most frequent variables affecting word-of-mouth advertising in sports were 0.46, 0.29, and 0.30, respectively; baxsed on Cohen's interpretative system, this effect was evaluated as moderate, although these relationships were significant (P≤0.05). Finally, by using a tree diagram, the studies that had the least deviation with the effect size of the random model were identified and identified as more valuable research. Also, according to the FSN test regarding the effect of satisfaction, trust and loyalty on word-of-mouth advertising in sports over several years, it can be claimed that these three factors have a positive effect on word-of-mouth advertising. Therefore, it is suggested that sports managers pay more attention to the needs and demands of consumers and improve their services to increase consumer satisfaction, loyalty and trust in their products and services, which leads to word-of-mouth advertising.