Listeria fleischmannii is a species of bacteria.

It is a Gram-positive, facultatively anaerobic, non-motile, non-spore-forming bacillus.

The species was first isolated in 2006 in Switzerland from hard cheese.

The species is named after Wilhelm Fleischmann, a pioneer in the research of dairy products.

[1] Listeria fleischmannii can be differentiated from other species of Listeria by its ability to ferment both D-mannitol and D-xylose.