Abstract: The purpose of research was aimed at explore the professional competence for Thailand’s offset printing industry. Discussion group of experts and survey questionnaire methodology was used in this research. The surveyed participants in this research were the managers and supervisors of the press operators in commercial printing companies. To analyze the result of surveys, several statistical methods including mean, SE and rank were conducted. The results from a discussion group of experts were that printing operators could be classified into 4 levels as follow; printing operator’s assistant, second hand printing operator, first hand printing operator and printing operator head. Afterwards, the professional competency of the printing operator’s assistant which had 7 main topics as follow; knowledge about color printing operation, materials and equipment, using technician’s tools, practice in offset printing, English for printing operators, maintenance and safety during work.