Listeria grandensis is a species of bacteria. It is a Gram-positive, facultatively anaerobic, non-motile, non-spore-forming bacillus. It is non-pathongenic and non-hemolytic. The species was discovered in and named after Grand County, Colorado, and its discovery was first published in 2014. L. grandensis is phenotypically similar to L. cornellensis, but L. grandensis shows temperature-dependent acidification of L-rhamnose.