Cardiobacterium
{{Short description|Genus of bacteria}}
{{Unreferenced|date=April 2025}}
{{Taxobox
| image = Cardiobacterium hominis.jpg
| image_caption = Cardiobacterium hominis on blood agar plate
| domain = Bacteria
| phylum = Pseudomonadota
| classis = Gammaproteobacteria
| ordo = Cardiobacteriales
| familia = Cardiobacteriaceae
| genus = Cardiobacterium
| genus_authority = Slotnick & Dougherty, 1964
| subdivision_ranks = Species
| subdivision =
}}
Cardiobacterium is a Gram-negative bacillus (rod-shaped) bacterium commonly grouped with other bacteria into the HACEK group. Species of Cardiobacterium include Cardiobacterium hominis and Cardiobacterium valvarum.