This In- vitro comparative studyaimed to evaluate and compare the marginal fit of full-contour monolithic zirconia crowns fabricated using conventional and digital impression techniques, as marginal adaptation is a key factor influencing the biological success and longevity of fixed dental restorations. Poor marginal fit can result in plaque accumulation, gingival inflammation, secondary caries, and eventual failure of the prosthesis. Fifteen samples of monolithic zirconia crowns were fabricated in each of three groups resulting in total sample size of 45 (n=45).Group 1 utilized the conventional polyvinyl siloxane impression technique (3M ESPE/Dentsply, USA) with a die model (Neelkanth, India), Group 2 employed digital impressions obtained from Digital Scanner-A (UPCERA, China) with a 3D-printed resin model, and Group 3 used digital impressions from Digital Scanner-B(Medit i600, South Korea) with a 3D-printed resin model. All crowns were fabricated using a standardized CAD/CAM workflow, andMarginal discrepancy was evaluated using a stereomicroscope at 45× magnification and analyzed using image analysis software. Statistical analysis was performed using one-way ANOVA followed by post hoc testing. The results showed that the conventional technique exhibited the highest marginal discrepancy (77–84 µm), whereas both digital techniques demonstrated significantly lower discrepancies (41–47 µm) (p < 0.005), with no statistically significant difference between the two digital scanners. Within the limitations of this In- vitro study, digital impression techniques demonstrated superior marginal fit compared to the conventional impression technique.