CLINT ERVEN H. MOSQUEDA. 2023. Effect of Utilizing Interactive Virtual Lab on Students Performance in Physics, MSTP Thesis. Graduate School, University of Southern Mindanao, Kabacan, Cotabato. 80pp.Major Adviser: JEAN R. MAGANAKA, MSTPThis research investigated the effect of utilizing interactive virtual lab (Labster) on students performance in physics among the grade 10 of Dungoan High School. It is a quasi-experimental research that uses the Randomized Pretest-Posttest Control Group Design, Using Matched Subjects. Differences in the performances of students who used Labster (experimental group) and with those who did not utilize it (control group) were tested in terms of the result in the posttest. Students performances were measured using a 40-item test that undergone pilot testing and content validation.Results revealed that the significant increase of students performance in the experimental group provides positive effect as (computed U = 2.000, p < 0.001). It wasfound that the use of Labster contribute on enhancing students learning in physics.Results in the rank gain scores with a significant difference in two groups (computed U = 5.500, p < 0.001) revealed that Labster also developed positive attitude towards learning physics with large Cliffs effect size difference of d = 0.71. Thus, there was a significant difference between the experimental and control group. The qualitative part of this research revealed that students perception in utilization of Labster was a great technological integration in terms of learning contents, interface design, and learning experiences with a weighted mean of 4.08, 4.34, and 4.72 respectively. Moreover, the experimental group experienced difficulties while using Labster such as (1) program incompatibility with lower processor (2) incapability to perform tasks with more than two activities at a time and (3) insufficient computer literacy.