The purposes of this paper are 1) to understand the attitude of Thai private higher education institutions toward internationalization, 2) to clarify current issues through attitude surveys related to internationalization efforts, and 3) to gain a clue to consider on the future internationalization process and progress of Thai private higher education institutions. The research was a questionnaire survey with seven questions. Fifteen institutions (9 universities and 6 colleges) that cooperated with the response became the target institutions for analysis. Cronbach’s reliability coefficient was 0.81. Through analysis and discussion, the internationalization efforts of universities and colleges differed in degree, and the domains of internationalization showed different processes. In the process of internationalization in the future, it is expected to utilize management approaches and formulate action plans specifically.