Dictyophorus spumans, the koppie foam grasshopper, , or African foam grasshopper, is a species of grasshopper in the family Pyrgomorphidae indigenous to southern Africa. The name "foaming grasshopper" derives from the insect´s ability to produce a toxic foam from its thoracic glands. The foam is created by a combination of haemolymph with air from the grasshopper´s spiracles. Its genus Dictyophorus is closely related to Phymateus.

Adult males are typically long and females typically , but can grow up to a length of . The neck shield has a warty surface, and the grasshopper´s colours are highly variable but usually with at least parts that are contrasting and bright. It is toxic due to the poisons that it sequesters from its diet, which includes a large number of toxic and distasteful plants such as milkweed.

Subspecies: 

• D. s. subsp. spumans – South Africa
• D. s. subsp. ater – northern South Africa and Zimbabwe
• D. s. subsp. pulchra – eastern South Africa and Mozambique
• D. s. subsp. servillei – southern Africa
• D. s. subsp. calceata – southern Africa