Aim: To assess and compare the retentive strength of stainless-steel crown cemented with glass ionomer cement (GC Fuji I), resin modiifed glass ionomer cement (Relyx Luting 2) and new self-adhesive resin cement (RelyX U200). Materials and Method: Forty-five extracted primary teeth were mounted on acrylic blocks. Stainless steel crowns were selected for each tooth. Three cements compared in this in vitro study were glass ionomer cement (GC Fuji I), resin modified glass ionomer cement (RelyX Luting2) and self-adhesive resin cement (RelyX U200). Teeth were randomly divided into three groups of 15 samples each. Retentive strength was tested using Instron Universal testing machine. The retentive strength values were recorded and calculated by the formula: Load/Area. Results: RelyX U200 (Self-adhesive resin cement) showed significantly higher retentive strength than rest of the two cements. No significant difference was found between RelyX Luting 2 (Resin modified glass ionomer cement) and GC Fuji I (Glass ionomer cement). Conclusion: The finding of our study suggests that self-adhesive resin cement was better than resin modified glass ionomer cement and glass ionomer cement. RelyX U200 (Self-adhesive resin cement) can be used for the cementation of stainless-steel crowns.