Louis Laneau (31 May 1637 in Mondoubleau – 16 March 1696 in Ayutthaya) was a French bishop of the 17th century who was active as a missionary in the kingdom of Siam (modern Thailand).

[1] On 4 July 1669, Laneau was appointed Vicar Apostolic of Siam and Titular Bishop of Metellopolis.

[1] As Vicar Apostolic of Siam, he was head of the French Roman Catholic mission in Indochina, with its headquarters at Ayutthaya.

[3] The Siamese king Narai warmly welcomed these missionaries, providing them with land for a church, a mission house, and a seminary (St Joseph's colony).

[6] As the French failed to respect several elements of the agreement, Laneau and his missionaries were imprisoned by the resentful Siamese.