Neolith Co., Ltd. (Korean: 네오리스), formerly known as Eolith Co., Ltd. (이오리스) is a South Korean based video game company, best known for co-developing The King of Fighters 2001 with BrezzaSoft and The King of Fighters 2002: Challenge to Ultimate Battle with Playmore, as well as their Hidden Catch series.

Their last title released as Eolith was Chaos Breaker, for the arcade system Taito Type X.

On June 7, 2000, they registered at KOSDAQ as the first Korean arcade game maker.

On June 3, 2005, Eolith was bought out by Netbrain, who was later integrated into the pharma company Neurotech and thoroughly restructured.

M-Dream became a separate company again, and continued to publish mobile games until 2007 when they were also shut down.