The Thai horseshoe bat (Rhinolophus siamensis), sometimes called the Thai leaf-nosed bat, is a species of bat from the family Rhinolophidae.

It is frequently listed as a subspecies of the Big-eared horseshoe bat, but this may be a result of the two species being taken in sympatry in Laos.

[1] It is native to China, Laos, Thailand, and Vietnam.

[1] Little is known about the Thai horseshoe bat, including its abundance, population size, population trend, major threats, natural history, or presence in protected areas.

[1] It is assumed that the Thai horseshoe bat is associated with limestone caves in evergreen forests like other species in its genus.