Abstract: This research aims to study the role of the teacher mentor in the development of Pedagogical Content Knowledge (PCK) of the Information and Communication Technology (ICT) trainee teachers. A total of 109 trainee teachers from the Degree in Information Technology Education (AT20) Sultan Idris Education University (UPSI) who have completed their 14 weeks teaching practice program were the respondents. This quantitative research used the questionnaire with a validity value of Alpha Cronbach 0.966. The research focussed on four PCK elements: i) communication; ii) knowledge about students and learning; iii) curriculum knowledge; and iv) knowledge on teaching strategy. The research found that all four elements are good. The mean of PCK communication element is 3.05, knowledge about student and learning is 3.25, curriculum knowledge is 2.94, and teaching strategy knowledge is 3.21. The percentage of mentoring proses rated by the trainee teacher is low (44%). A total of 56% of trainee teachers are not satisfied with the mentoring received which is within the range of 20% to 50% only. Further detailed research is needed to measure the role of teacher mentor in developing the PCK of the ICT trainee teachers.