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| Context | Spain and England undertake not to assist enemies of the other; England agrees to mediate an end to the Portuguese Restoration War; Spain awards England commercial privileges |
|---|---|
| Signed | 23 May 1667 |
| Location | Madrid |
| Condition | 21 September 1667 |
| Negotiators |  Sir Richard Fanshawe Earl of Sandwich  Medina Sidonia Juan Nithard |
| Signatories | Earl of Sandwich Count Peñaranda Count Oñate |
| Parties | England Spain |
| Ratifiers | Charles II of England Mariana of Austria for Charles II of Spain |
| Language | Latin |
The Treaty of Madrid, also known as the Earl of Sandwich's Treaty, was signed on 23 May, 1667 by England and Spain. It was one of a series of agreements made in response to French expansion under King Louis XIV.
The parties agreed to commercial terms allowing English merchants trading privileges within the Spanish Empire that remained in place until superseded by the Treaty of Utrecht in 1714. They undertook not to assist each other's enemies, and England also agreed to mediate an end to the 1640-1668 Portuguese Restoration War, which resulted in the 1668 Treaty of Lisbon between Spain and Portugal.
The issue of Spanish possessions captured by England in the Anglo-Spanish War (1654-1660) was settled by the 1670 Treaty of Madrid.