Background:
This study purposes to determine the relationship between the professional values and critical thinking disposition of science-technology and mathematics teachers working in middle schools.

Materials and methods:
The study follows the survey research model. The sample of the study is comprised of a total of 193 teachers (90 science-technology teachers and 103 mathematics teachers) working in Afyonkarahisar city, and other outlying villages in the same province. Data collection tools of the study are Teachers’ Professional Values Scale (TPVS) and California Critical Thinking Disposition Inventory (CCTDI). Descriptive statistics, t-test, ANOVA and correlation analysis have been used for data analysis.

Results:
The results of the study have shown that teachers’ level for having Professional values is above moderate, while critical thinking disposition is low.

Conclusions:
There are significant relationships between teachers’ professional values and their critical thinking disposition.