This chapter describes India’s trade and investment relations with Southeast Asia and its policies to increase integration. India’s regional integration with Southeast Asia has been advancing well and several projects are being implemented currently. India’s regional connectivity with Southeast Asia has been evolving on two pillars: Northeast India for multimodal and intermodal operations and Southern India for multimodal operation. It presents India’s broad proposals on connectivity projects with Southeast Asia and policy recommendations to strengthen connectivity in Asia in general and that between ASEAN and India in particular. Enhancing connectivity between South and Southeast Asia is a multifaceted task that will require the implementation of strong policy initiatives. Development of the Southeast Asia and South Asia connectivity would throw up significant opportunities to industrial development in India and its trade potential with South and East Asian countries.