Count Joseph Maria Anton Brassier de Saint-Simon-Vallade (8 August 1798 – 22 October 1872) was a Prussian diplomat.

His parents were the Privy Councilor Marie Louis Joseph Brassier de Saint-Simon-Vallade, who was born in Strasbourg, and his wife Louise von Stampfer.

He passed the auscultator (trainee lawyer) examination in April 1822 and was awarded a doctorate in the same year.

[3] After temporary working in the Ministry of Foreign Affairs, he took up the new post of Resident Minister in Athens in November 1838 before being appointed envoy on 16 January 1842.

In 1857 Brassier was elevated to the rank of count by the Prussian King Frederick William IV.