Background: Nomophobia, defined as the fear or anxiety of being without a mobile phone, is an emerging concern among youth and may influence lifestyle such as physical activity.

Objective: This study aimed to examine the association between nomophobia and physical activity levels among youth.

Methods: An observational study was conducted using convenience sampling. A total of 200 participants completed the Nomophobia Questionnaire (NMPQ) and the International Physical Activity Questionnaire (IPAQ). Descriptive statistics were calculated, and Pearson’s correlation test was used to determine the strength and direction of the relationship between NMPQ and IPAQ scores.

Results: The analysis revealed a moderate negative correlation between NMPQ and IPAQ scores (r = –0.4032), which was statistically significant (t = –6.19982, p < 0.001). This indicates that as nomophobia severity increases, physical activity levels decrease. Descriptive findings showed that inactive participants had higher NMPQ scores than minimally active participants, particularly in mild and moderate nomophobia categories.