Jeff Greinke (b. 1959) is an American ambient music and jazz artist and composer currently based in Tucson, Arizona. He is known as one of the pioneers of dark ambient music, with his earlier solo albums often compared to works by Robert Rich, Brian Eno, and Vidna Obmana. Greinke's approach on his ambient works is to heavily layer, multitrack, and texture soundscapes, effectively using the studio as an instrument.

In 1993 Greinke founded the group LAND, described by guitarist Dennis Rea as "an odd blend of jazz, rock, electronic, and world music." LAND released three albums between 1995 and 2001 and also played live extensively, including a 1996 tour of China, Hong Kong, and Macau.

Greinke is also half of the duo Hana with Sky Cries Mary vocalist Anisa Romero. Hana has released two albums to date.

Greinke spent his early life in New Jersey, later moving with his family to Chicago and Pennsylvania. He studied meteorology at Penn State University, where he began composing and performing music in 1980, then relocated to Seattle in 1981, before eventually settling in Tucson.