Abstract: Background: Reproductive health is a critical component of overall health and development. Unmet contraceptive needs are one of the regularly cited measures of the efficacy of family planning (FP) initiatives. This study set out to determine the magnitude and associated factors of unmet need for FP among women of reproductive-aged (15-49 years) in the provincial areas of The Gambia. Methods: The study used a community-based cross-sectional analytical design. A multistage sampling strategy, comprising simple random and cluster sampling, was utilized to obtain a sample of 643 childbearing women (15-49 years) from rural Gambia's sampled clusters. Data collection was conducted using pre-tested structured interview questionnaires. The association was examined using chi-square/fisher's exact test with a significance level of p<0.05. Binary logistic regression analysis was performed to examine the effect of sociodemographic and cultural determinants on unmet FP need, with corresponding computed adjusted odds ratios (aOR). IBM SPSS version 24 was used for data entry and analysis. Results: The unmet need for FP among the study participants was 25.2%; unmet need for spacing and unmet need for limiting was 17.4% and 7.8%, respectively. The total demand for FP was 59.4%, while the satisfaction of demand for FP was 57.6%. The significant predictors of unmet need for FP were woman’s age at first pregnancy (aOR=0.899, p=0.033), LGA of origin (aOR=0.240, p=0.001) and frequency of using contraceptives (aOR=1.587, p=0.032). Conclusion: The present study demonstrated a high unmet need for FP among rural women in The Gambia, with the most often cited reason for non-use being fear of side effects. Hence, it is necessary to concentrate FP services for rural populations, stressing education regarding contraceptive side effects, service quality, and gender equality. Additionally, the study suggests that male participation and religious leaders' involvement in FP programs be strengthened and mainstreamed, as well as the establishment of a communication program that specifically promotes inter-spousal communication.