The main purpose of the current study is to investigate middle school students' math self-efficacy perceptions and math problem posing attitudes. The sample of the study is comprised of 990 fifth, sixth, seventh and eighth grade students attending middle school in the Fethiye district of the city of Mugla. As the data collection tool, the "Math Self-efficacy Perception Scale" and the "Math Problem Posing Attitude Scale" were used. In the analysis of the data collected through the qualitative research method, frequencies, percentages, independent-samples t-test, one-way variance analysis, post-hoc tests (Scheffe and Dunnett's C) and correlation analysis were used. As a result, it was found that the middle school students' math self-efficacy perceptions and math problem posing attitudes are over the medium level. The middle school students' self-efficacy perceptions were found to be varying significantly depending on gender. The middle school students' problem posing attitudes were found to be varying significantly depending on gender. The math self-efficacy perceptions and math problem posing attitudes of the 5th and 6th grade students were found to be significantly higher than those of the 7th and 8th grade students. A medium, positive and significant correlation was found between the middle school students' mean math self-efficacy perception score and their mean math problem posing attitude score.