Eelke Kleijn (born June 11, 1983) is a Dutch producer and DJ hailing from Rotterdam, the Netherlands. He is known mostly for his electronic dance music, but nowadays also produces music for other media, such as television series, commercials, movie trailers and animations.

In his early career (between 2003 and 2005), he mainly produced electronic records as M.I.D.O.R. & Six4Eight, and he was responsible for some of the DJ Precision releases and remixes. His first release as 'Eelke Kleijn' was '4.5 Billion Years' in 2003 on Segment Records. From 2005 onwards, he solely released music under his own name. His breakthrough came in 2006 when Nick Warren used the track '8 Bit Era' for his 'Global Underground: Paris' compilation. As a result, Eelke released his first artist album 'Naturally Artificial' on Global Underground in 2007. Between 2008 and 2012, he remixed artists such as Goldfish (band), Dave Seaman, Way Out West, Hybrid, Sander Kleinenberg and Nadia Ali. In 2010 Eelke released his second artist album 'Untold Stories' on Manual Music. As a DJ, Eelke has played many venues and festivals including Mystery Land, Extrema Outdoor, Dance Valley, Sensation, Warung Brazil, Privilege Ibiza and Moonpark Buenos Aires.
Since 2010 Eelke Kleijn as a producer is also involved in composing music for animations, games and advertisement. More recently he devoted himself to creating music for Hollywood movie trailers and TV series. He also hosts a monthly radio show and podcast 'Outside the Box', and manages the record labels Outside the Box Music, Survival and Down Under.