San Buena Ventura was a 120-ton ship built in Japan under the direction of the English navigator and adventurer William Adams for the shōgun Tokugawa Ieyasu. The ship was built in 1607, and followed the construction of a smaller 80-ton ship, also by William Adams, which had been used for the charting of the waters around Japan. Tokugawa Ieyasu ordered the second, bigger, ship for travels to other countries.