This study investigated the relationship between response rate and effect size in self-report survey research. The correlation between response rate and effect size was calculated for 4 variable combinations, and the results were combined using meta-analytic procedures. The correlation of response rate and effect size was not significant for any individual sample. The average correlation between response rate and effect size was -.15, with a nonsignificant corrected variance across studies of .02. These results suggest only a small relationship between the response rate of a survey and the reported effect size between variables.