Kiaphet Amman'sor is a fictional character from the Star Trek universe.

Kiaphet Amman'sor is a female aquatic of the multi-species race Xindi. She is a member of the Ibix dynasty, a wealthy and powerful aquatic family. Kiaphet is also the head aquatic in the Xindi Council. She is always seen in a tank that ajoins the Council chamber

For a long time, Kiaphet and her mate were against building the Xindi weapon. They were convinced when the Sphere Builders showed what they claimed was video footage from the future. It showed mankind destroying the Xindi's new homeworld.

Kiaphet, for the next few years, tried to hold the Council together while convincing it that the weapon was necessary. When Captain Archer confronted the Council to convince them not to launch the weapon, Kiaphet believed that they should take his testimony into account.