Predators of nematodes continually excite interest amongst nematologists when observed to attack and consume nematode pests. Unfortunately, few nematologists are employed to study such organisms and knowledge of these predators has accumulated slowly. Information is also derived from the work of other biologists concerned with the feeding ecology of the taxa in which predators of nematodes are found. These groups include Protozoa, Turbellaria, Tardigrada, Oligochaeta, Insecta, and Acari as well as Nematoda. The last group has probably attracted most attention, possibly through the double-interest for nematologists of one nematode feeding upon another.