The study aimed to determine: (1) the effect of online inquiry learning methods on increasing the knowledge of basic soccer techniques for class XI students and (2) differences in knowledge of basic soccer techniques for class XI students between the experimental group and the control group. The method uses a “pre-test post-test control group design" experiment. The sampling technique is simple random sampling, totaling 33 students in the experimental class with the inquiry learning method treatment and 34 students in the control class. The instrument used is an essay test. Data analysis used a t-test with a significance level of 5%. The study results: (1) There is a significant effect of the online inquiry learning method on increasing the knowledge of basic soccer techniques for class XI students, the t value is 12.158 > t table is 1.693, and the significance is 0.000 < 0.05. (2) There is a significant difference in the knowledge of basic football techniques of class XI students between the experimental group and the control group; the t-count value is 9.617 > t-table 1.668, and the significance is 0.000 < 0.05.