Understanding what motivates teachers is essential for Ministries of Education to sustain a dedicated and stable teaching workforce. This study explored teacher motivation to remain in the teaching profession in Thailand, along with factors that influence them. A survey was done to collect the data. Descriptive statistics revealed that the majority of Thai teacher respondents are motivated to continue their service. They also view the examined motivational factors positively and consider them relevant to their decision to stay. Inferential analysis unveiled the association between motivation levels and length of teaching. Statistically significant differences in motivation were also found among teacher respondents based on frequency of salary increases, provision of teaching and learning resources, adequacy of school facilities, highest education attainment, promotion history, and frequency. Using hierarchical regression analysis, a predictive model was developed that identified a combination of motivational factors and demographic characteristics that influence teacher respondents’ decision to remain in the profession. Policy recommendations were proposed based on the study’s findings to address both individual and systemic aspects that could improve teacher motivation.