Neolith Co., Ltd., formerly known as Eolith Co., Ltd. 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.

The King of Fighters 2001 (KOF 2001, or KOF '01) is a fighting game produced by Eolith for the Neo Geo. It is the eighth game in The King of Fighters series, the third and final part of the "NESTS Chronicles" story arc, and the first game produced following the closure of the original SNK. The game was produced by the South Korea-based company Eolith and developed by Eolith and BrezzaSoft, a company formed by former SNK employees. For this reason, the SNK logo is displayed at the opening, but SNK's development staff is not involved in the production of the game itself at all, except for the game sound. Due to the influx of Korean capital, its influence can be seen in the participating characters. The game was ported to the Sega Dreamcast in Japan only and PlayStation 2. The stand-alone PlayStation 2 version was released in North America and in Europe in a two-in-one bundle with the preceding game in the series, The King of Fighters 2000. Both the original Neo Geo version and the Sega Dreamcast version were included in The King of Fighters NESTS Hen compilation released for the PlayStation 2 in Japan.