Jean-Louis Vey MEP (16 January 1840 – 21 February 1909) was a French Catholic missionary, priest and bishop who served as Vicar Apostolic of Eastern Siam from 1875 to 1909.

[1][2] On 14 July 1865, Vey departed for the mission of Siam (now Thailand) which had twenty European missionaries and ministered to 10,000 Christians.

[3] In July 1875, he was appointed Vicar Apostolic of Eastern Siam, and nominated Titular Bishop of Gerasa.

In December of that year, he was ordained as Titular Bishop of Gerasa in the church of St Francois Xavier in Bangkok.

However, his plans for the evangelisation of Northwest Siam, near the border with Burma, were not realised due to lack of resources and personnel.