Purpose: This study aims to assess the impact of technology adoption on sustainable smallholder dairy production under contract farming as opposed to non-contract farming. Materials and Method: The research used a cross-sectional quantitative method. Smallholder dairy farmers from two north-western agro-ecological regions of Bangladesh completed a 35- item (15 demographics and 20 IVs-DV related) structured survey questionnaire, which examined how technology adoption affects sustainable dairy production and the contribution of the private dairy processor in this relationship. Out of 100 purposive samples, 50 were under contract farming, and 50 were without a contract. Results: Breed, feed, and cellphone networking were considered technology adoptions (IVs) against sustainable dairy production (DV). Six hypotheses were tested to find the relationship between variables in each option. Adoption of three technologies (BTA→SDP = 0.012<0.05), (FTA→SDP = 0.033<0.05), (CPN→SDP = 0.037<0.05) under contract farming are all significantly related, while for non-contract farmers, only cellphone networking is significantly related (BTA→SDP = 0.791>0.05), (FTA→SDP = 0.275>0.05), (CPN→SDP = 0.017<0.05). It reflects that technology adoption under contract farming is better than non-contract farming. Conclusion: Technology adoption is crucial for smallholder sustainable dairy production. Technology costs money, and impoverished farmers need support from stakeholders. The private dairy processor can support these farmers with technology adoptions. The findings of this study support contract farming and can be used as a model for others. It also benefits the dairy industry, academia, researchers, and policymakers.