Sir William Brouncker (c. 1547 – 1596) was an English landowner and member of parliament.
He was the eldest son of Henry Brouncker of Melksham and Erlestoke by his second wife Ursula Yate.
[2] He succeeded his father in 1568, becoming a wealthy landowner with estates near Chippenham and Devizes, and property in Westbury, Wiltshire.
[3] He married Martha, the daughter of Sir Walter Mildmay the following year[4] As a substantial local landowner he secured his own election and that of his younger brother Henry as Member (MP) for Westbury in 1572.
[3] As an MP he was active as a committee man and is recorded as having spoken three times in his last parliament.