Notarius armbrusteri is a species of catfish in the family Ariidae. It was described by Ricardo Betancur-RodrÃÂguez and Arturo Acero Pizarro in 2006. It inhabits marine waters around Buenaventura, Valle del Cauca, in Colombia. Males reach a maximum standard length of , while females reach a maximum SL of .
The species epithet "armbrusteri" was given in honour of Jonathan W. Armbruster, a curator at the Auburn University Museum, whom the authors credited with providing important contributions to the taxonomy of catfish in neotropical regions.