The present study was aimed at finding out the effectiveness of miracle questions on the rational problem-solving ability of students in the students Association of Educational Psychology and Guidance, Faculty of Education, Yogyakarta State University (HIMA PPB FIP UNY). This study employed a quantitative approach with single-subject experimental design. The subject of the study five students consisting of 3 male and 2 female students, they were selected by using purposive sampling technique. The data were collected using a problem-solving scale and counseling guideline for miracle questions technique. The data were analyzed using Wilcoxon test. The result of the study exhibited that miracle questions technique was effective in improving students' rational problem-solving skill. The result of the study can be used as a reference in developing guidance and counseling program for improving students’ rational problem solving by using miracle questions.