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Oil-in-oil nonaqueous emulsions are of great interest for developing emulsion-templated polymers and encapsulation systems that are incompatible with water-sensitive substances. Here, the stabilization of oil-oil interface by bottlebrush random copolymers (BRCPs) containing norbornene backbones with densely grafted poly(methyl methacrylate) and polystyrene side chains is presented. Due to the high efficiency of BRCPs in reducing the interfacial tension, when using BRCPs as stabilizers, stable oil-in-oil traditional emulsions and high internal phase emulsions can be successfully obtained. More details are discussed in the article by Shi et al. on pages 139—145.