The Company of Merchant Adventurers usually refers to the Company of Merchant Adventurers of London, founded in 1407 and London's leading guild of overseas merchants.

It may also refer to:

• Company of Merchant Adventurers to New Lands, founded in 1555 and usually known as the Muscovy Company or the Russia Company.
• Company of Merchant Adventurers of Newcastle.
• Company of Merchant Adventurers of York who, uniquely still own and use their original timber-framed Guildhall completed by 1368, the Merchant Adventurers' Hall
• The Bristol equivalent is the Society of Merchant Venturers, now a charitable organisation.

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