Food allergies are significant global public health challenges, imposing substantial medical costs. Advanced thermal and non-thermal approaches emerged to mitigate allergens but have yet to be commercialized. This review analyzed progress in applying emerging technologies for mitigating food allergenicity and discussed the mechanisms involved, focusing on sustainability aligned with the sustainable development goals (SDGs). Emerging food processing technologies offer new options for producing high-quality food with low allergenicity. Cold plasma, ultrasound, pulsed electric field, high-pressure processing, microwave, and ohmic heating have removed up to 96, 76, 67, 71, 80, and 65% of allergens in oriental shrimp, white leg shrimp, Chinese white shrimp, peach, unripe green kiwifruits, and eel, respectively. Comparative analysis of emerging technologies in allergenicity reduction was performed, and cold plasma was identified as having the highest relative effectiveness. Emerging technology-based allergenicity reduction has been found to have significant contributions to eight SDGs, revealing its role in sustainable food production. Challenges were identified, and a future research direction was proposed to consider in vivo validation and product safety and quality. Also, pathways through which emerging technologies can practically contribute to SDGs were proposed, outlining the importance of proteomics and simulations for mechanisms, multi-parameter optimization, standardized allergenicity models, safety frameworks, global standards, and engineering for efficiency and sustainability.