The Lord Warden of the Stannaries used to exercise judicial and military functions in Cornwall, England, UK, and is still the official who, upon the commission of the monarch or Duke of Cornwall for the time being, has the function of calling a stannary parliament of tinners. The last such parliament sat in 1753.

The Cornish Stannary Parliament was the representative body of the Cornish stannaries, which were chartered in 1201 by King John. In spite of the name, the Parliament was not a Cornish national assembly, instead representing the interests of the tin industry; however, due to the significant proportion of Cornwall's population involved in the tin trade, it wielded considerable power.