Lessepsian migrants, named after Ferdinand de Lesseps, the French engineer in charge of the Suez Canal's construction, are marine species that are native to the waters on one side of the Suez Canal, and which have been introduced by passage through the canal to the waters on its other side, giving rise to new colonies there and often becoming invasive.
Most Lessepsian migrations are of Red Sea species invading the Mediterranean Sea; few occur in the opposite direction.