Migration by sea is the movement of people across water using boats or ships. It has taken place in both ancient and modern times. Oceans, seas, and rivers have served as travel routes.

Polynesian groups crossed the Pacific Ocean to settle distant islands, while later migrations included voyages during the Age of Exploration between the 1400s and 1700s. Ships carried families, goods, and communities to new regions.

Migration by sea is recorded in maps, ship logs, and historical accounts. It shows how people moved across large distances and settled new areas.