Sea Venture was a seventeenth-century English sailing ship, part of the Third Supply mission flotilla to the Jamestown Colony in 1609. She was the 300 ton flagship of the London Company. During the voyage to Virginia, Sea Venture encountered a tropical storm and was wrecked, with her crew and passengers landing on the uninhabited Bermuda. Sea Venture's wreck is widely thought to have been the inspiration for William Shakespeare's 1611 play The Tempest.

The proprietors of the London Company had established the settlement of Jamestown in Virginia in 1607, and delivered supplies and additional settlers in 1608, raising the English colony's population to 200, despite many deaths. The entire operation was characterized by a lack of resources and experience. The company's fleet was composed of vessels that were less than optimal for delivering large numbers of passengers across the Atlantic Ocean, and the colony itself was threatened by starvation, diseases, and warfare with native peoples.

The colony at Jamestown seemed doomed to meet the same fate as the Roanoke Colony and the Popham Colony, two earlier failed English attempts to settle in North America, unless there was a major relief effort, despite the delivery of supplies in 1608 on the First and Second Supply missions of Captain Christopher Newport. Yet the investors of the London Company expected to reap rewards from their speculative investments. With the Second Supply, they expressed their frustrations and made demands upon the leaders of Jamestown in written form. They specifically demanded that the colonists send commodities sufficient to pay the cost of the voyage, a lump of gold, assurance that they had found the South Sea, and one member of the lost Roanoke Colony.

It fell to the third president of the council to deliver a reply. Ever bold, Captain John Smith delivered what must have been a wake-up call to the investors in London. In what has been termed "Smith's Rude Answer", he composed a letter, writing (in part):

When you send againe I entreat you rather send but thirty Carpenters, husbandmen, gardiners, fishermen, blacksmiths, masons and diggers up of trees, roots, well provided; than a thousand of such as wee have: for except wee be able both to lodge them and feed them, the most will consume with want of necessaries before they can be made good for anything.

Smith did begin his letter with something of an apology, saying "I humbly intreat your Pardons if I offend you with my rude Answer".

There are strong indications that those in London comprehended and embraced Smith's message. Their Third Supply mission was by far the largest and best equipped. They even had the newly constructed purpose-built flagship Sea Venture placed in the most experienced hands of Christopher Newport.

Sea Venture was most likely built in 1603 and used in trade with the Low Countries – though there are competing theories which do not stand scrutiny. The archaeological evidence suggests that she was not a newly-built vessel at the time of her loss. She was, however, built according to the latest methods for the early 17th century. As such her shape is a development from vessels such as Mary Rose. Her hull shape can be extrapolated from the limited archaeological remains to show a stable hull (even allowing for some inaccuracies in that process) – a finding that is confirmed by her surviving a hurricane (it was a leak that was the problem that arose during the storm).