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Khamti Lahi is a traditional indigenous rice variety of Arunachal Pradesh valued for its cultural importance, grain quality, and adaptability to local agro-climatic conditions. However, its productivity under traditional cultivation practices remains comparatively low. A field experiment was conducted during the kharif season of 2025 at the agricultural research farm, himalayan university, jollang, itanagar, to evaluate the influence of different plant bio-regulators on the growth and yield performance of Khamti Lahi rice under the agro-climatic conditions of Arunachal Pradesh. The experiment was laid out in a Randomized Block Design (RBD) with three replications and nine treatments, viz., T₁-Control, T₂- Seaweed extract at 0.5ml, T₃- Seaweed extract at 0.5ml + Urea at 1.5%, T₄-Jeevamrut at 100ml, T₅- Jeevamrut at 100ml + Urea at 1.5%, T₆- Thiourea at 500ppm, T₇- Thiourea at 1000ppm, T₈- Gibberellic acid at 100ppm, T₉- Gibberellic acid at 100ppm + Urea at 1.5%. The results revealed that plant bio-regulators significantly influenced the growth and yield parameters of Khamti Lahi Rice. Among the treatments, T₈ (Gibberellic acid 100 ppm) recorded the highest grain yield (2.0 t ha^-1), straw yield (13.4 t ha^-1), and harvest index (14.2 t ha^-1), followed by gibberellic acid application may be attributed to enhance cell division, elongation, photosynthetic efficiency, and better assimilate translocation towards reproductive parts. In contrast, the control treatment recorded the lowest values for all parameters. The study concludes that the application of plant growth regulators, particularly gibberellic acid at 100 ppm, is highly effective in improving growth, yield and productivity of Khamti Lahi Rice under the agro-climatic conditions of Arunachal Pradesh.