Health information seeking has been defined as the ways in which individuals obtain information, including information about their health, health promotion activities, risks to one’s health, and illness for the purpose of decision-making. It also can be defined as a problem-focused coping mechanism in medical decision-making. The purpose of this study was to identify patterns of health information seeking behaviour (HISB) among T2DM patients in Selangor and Negeri Sembilan government health clinics. This study assessed health behaviour patterns by identifying patients' preferred sources of information, diabetes information types, barriers encountered while searching for information, information needs, patients' health literacy (HL) level, and the correlations between HISB and HL. Multi-stage random sampling was utilised in this cross-sectional study to select the eligible patients to answer validated HISB Self-administered Questionnaire (SAQ). A total of 999 patients; 693 from Selangor and 306 from Negeri Sembilan were recruited with assistance by the nurse supervisors at government healthcare facilities in both states.