Notarius armbrusteri is a species of catfish in the family Ariidae.

[1] It was described by Ricardo Betancur-Rodríguez and Arturo Acero Pizarro in 2006.

It inhabits marine waters around Buenaventura, Valle del Cauca, in Colombia.

Males reach a maximum standard length of 17.7 cm (7.0 in), while females reach a maximum SL of 20.8 cm (8.2 in).

[1] 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.