Matthijs Hendrikszoon Quast (died 6 October 1641), anglicized as Matthys[1] and Matthew Quast, was a Dutch merchant and explorer in the service of the Dutch East India Company (VOC). Quast made several voyages on the VOC's behalf to Tokugawa Japan, the Qing Empire (China), and Ayutthaya Kingdom ("Siam")[2] but is primarily remembered for his failed 1639 expedition in search of the phantom islands of Rica de Oro and Rica de Plata previously reported by Spanish mariners. He is sometimes credited with the first recorded discovery of the Bonin Islands during the voyage, although the VOC did nothing with the information and they remained unimportant and sparsely settled until the 19th century.