Understanding gender discrimination relationships is essential, particularly in the workplace context where it may impact on employee relationships and their opportunities for career advancement. The study described the gender discrimination experiences, and career advancement of instructors in terms of salary, promotion and training and development. Also, the study determined the significant gender differences in terms of discrimination experiences and career advancement. The descriptive method of research was used in this study. A total of 93 teaching personnel (37 females, 25 males, and 31 LGBTs) were surveyed using a questionnaire with likert-scale responses. Based on the results of the study, the researcher concluded that teaching personnel from private schools, in general, rarely experienced gender discrimination in their schools. But there were specific experiences that they sometimes experienced like their gender influences their profession and their suggestions and opinions are sometimes unaccounted. There was also career advancement in terms of salary and promotion but not in training and development. And, there was no significant gender difference in terms of discrimination experiences and career advancement among male, female and LGBT teaching personnel from private school. It is then recommended by the researcher that private schools should have capacity building in dealing with gender discrimination among their teacher personnel and also the schools must have focal person to talk to for the career advancement of the teaching personnel especially in terms of training and development. Support from other staff of the schools is highly encouraged.