The main objective of this study is to explain and prioritize institutional (legal-policy), managerial, and technical-structural strategies for preventing the unauthorized conversion of agricultural land in Ilam Province. This research was conducted using a mixed-method (qualitative-quantitative) approach and a descriptive-survey method. In the qualitative phase, semi-structured interviews were conducted with 15 experts, and the data were analyzed using the Delphi method. In the quantitative phase, the statistical population included 310 heads of households who had converted land use over the past five years, and the sample size was determined using Cochran's formula. The data collection tool was a researcher-made questionnaire whose validity was confirmed by experts and whose reliability was verified with a Cronbach's alpha of 0.833. The qualitative findings led to the identification of 40 strategies in three dimensions: legal-policy (13 strategies), managerial (16 strategies), and technical-structural (11 strategies). The quantitative results showed that, from the respondents' perspective, legal-policy strategies with a mean of 3.33 and managerial strategies with a mean of 3.31 ranked first and second, while technical-structural strategies with a mean of 3.14 ranked third. Also, exploratory factor analysis showed that in the legal-policy dimension, the factor "strengthening enforcement guarantees and controlling land ownership" with 21.1% and the factor "reforming and modernizing legal frameworks" with 12.9% played the largest roles. In the managerial dimension, the factor "coordination and organizational management among relevant institutions" with 14.1%, and in the technical-structural dimension, the factor "integrated information and licensing systems" with 16.8% had the greatest impact. The results of this study indicate that weak law enforcement, the multiplicity of responsible institutions, and the lack of an integrated monitoring system are among the most important factors facilitating unauthorized land-use change in Ilam Province. Success in controlling this phenomenon requires amending laws, strengthening enforcement guarantees, inter-agency coordination, establishing smart monitoring systems, and improving agricultural infrastructure.