The red top williamsi (Pseudotropheus williamsi) is a species of cichlid endemic to Lake Malawi where it occurs in areas with rocky substrates usually at depths of less than 2 metres (6.6 ft).

This species can reach a length of 16.5 centimetres (6.5 in) TL.

It can also be found in the aquarium trade.

[2] The specific name honours the Anglican missionary Joseph A .

Williams who died by drowning in Lake Malawi in 1895, with Bishop Chauncy Maples, and who collected the type of the cichlid among others.