This study aims to determine or confirm the presence or absence of a correlation between screen time with memory retention and concentration. A quantitative quasi-experimental research design was utilized to assess the students’ memory retention and concentration. Fifty-three students were selected using a non-probability sampling technique known as purposive sampling. The procedure in data collection was through a questionnaire, which was designed to evaluate the amount of screen time of its respondents, as well as performance tasks such as the Rey Auditory Verbal Learning Test to measure memory, and the Stroop Test to measure concentration. The respondents were found to spend 4.5 times longer on screen time than the recommended amount by the American Academy of Pediatrics. The results showed a negative correlation between the use of smartphones and the scores of the Rey Auditory Verbal Learning Test and the Stroop Test, indicating a negative correlation between screen time to memory retention and concentration. Demographic variables such as grade level and gender were also considered during the course of this study, and results suggest that there is no statistical significance between these two variables to memory retention and concentration. This study confirms that as the smartphone use of the respondent increases, their memory retention and concentration decreases.