This study investigated the Emotional Intelligence (EI) of Science, Technology and Engineering (STE) science teachers based on their demographic profile. Total enumeration was used and 113 STE science teachers in Region 1 Philippines participated in this study. The study adopted descriptive- quantitative research design, frequency count and percentage, weighted mean (WM), t-test and ANOVA were utilized and to look deeper on the magnitude of the demographic profiles on EI, effect size was used. The results showed that some of STE science teachers belongs to 30-39 age bracket. In terms of sex most of STE science teachers are females. In terms of position some are Teacher III. In terms of length of service, some are in service for 0-5 years. STE science teachers have an average EI. Difference of EI on respondents' age was also investigated and revealed in over-all EI, that there is a significant difference between STE science teachers' age. Further, an effect size of 0.01 was tabulated which means it has a small effect. Difference of EI between sexes had also been investigated and found out that there is a significant difference between the STE science teachers' sex and EI. Further, the effect size was 0.27. Differences of EI against the STE teachers' position had also been investigated results revealed that, there is no statistically significant difference. Difference of EI against respondents' length of service had also been investigated and revealed that, there is no statistically significant difference between respondents' length of service and EI. Conclusions include: STE science teachers is female-dominated in their middle-age, and who are relatively young in the service; STE science teachers' can assess others' emotion, moreover, they can highly assess their own emotion with high level of emotional control, and thus they can interact excellently with other people, and use their emotion in a positive way with positive outlook in life; STE science teachers EI is dependent on their age and sex.