Cereal-legume integration is crucial for maintaining the long-term productivity and sustainability. Cereal-legume integration can potentially stabilize ecosystems, mitigate global climate change, and enhance food-security by improving soil organic carbon, land management, erosion prevention, and reducing the use of harmful chemicals. Cereal-legume intercropping utilizes the available resources efficiently, improving crop yield by ~10–25%, and promoting biodiversity. Legumes fix atmospheric nitrogen, which benefits cereal crops by improving nitrogen availability, reducing reliance on synthetic nitrogen fertilizers and improving soil health. Legumes, through their symbiotic relationship with rhizobia, convert atmospheric nitrogen into ammonia and provide up to 73% of the nitrogen requirements of other crops. This integration also reduces negative environmental outcomes, by improving carbon retention, nitrogen use-efficiency (~25%), while reducing NO3-N leaching (~10–16%), GHGs emission (~10–25% CO2 and ~15–35% N2O). It also improves soil microbial diversity, which is essential for nutrient cycling and plant growth. The complementary root systems of cereals and legumes demnify nutrient competition, encouraging greater nitrogen fixation and improving soil fertility. Cereal-legume systems enhance phosphorus acquisition due to increased root surface area, improving nutrient exploration. Overall, cereal-legume integration offers a promising sustainable approach to agriculture by boosting productivity, reducing environmental impacts, and enhancing soil health.