Marie Melchior Joseph Théodose[1] de Lagrené (14 March 1800, in Amiens – 26 January 1862, in Paris), was a French legislator and diplomat.

[3] He joined the French diplomatic service at a young age and served in the foreign ministry under Mathieu de Montmorency, accompanying him to the Congress of Verona in 1822.

Lagrené remained in office after the establishment of the July Monarchy in 1830 and he went on to hold a number of prominent positions in the French foreign service.

On 24 October 1844, Lagrené and Qiying concluded the Treaty of Whampoa, which legalized the practice of Christianity in China and opened the way for missionary activities.

After the fall of the July Monarchy in 1848, Lagrené left the government service, and in 1849 he was elected as the representative of the Somme in the French legislative assembly, where he consistently supported conservative causes, such as the restriction of the suffrage.