Konrad "Conny" Plank (3 May 1940 – 5 December 1987) was a German record producer and musician. He is known for his innovative work as a sound engineer and producer in Germany's krautrock and kosmische music scene in the 1970s. Plank was involved in releases by Neu!, Kraftwerk, Cluster, Harmonia, Ash Ra Tempel, Guru Guru, Kraan, and other German groups of the era. He later produced for new wave acts such as D.A.F., Eurythmics and Ultravox and was influential to producer Martin Hannett.

As a billed performer, Plank also formed the group Moebius & Plank, releasing 5 albums between 1979 and 1986.

In mid-to-late 60s, Conny attended new-music courses at the Rheinische Musikschule in Cologne, taught by Karlheinz Stockhausen, Luciano Berio, Henri Pousseur, and Earle Brown.

In the late 1960s, Plank began producing albums and working as a sound engineer, and became involved in the underground music scene, which was spreading from Berlin throughout Germany. In 1969 he served as engineer for the first Kluster album, Klopfzeichen, which was released the following year. His long association with Dieter Moebius and Hans-Joachim Roedelius of Kluster and later Cluster endured until his death. He also served as engineer for Alexander von Schlippenbach's album The Living Music, which was released in 1969, the first of a long list of engineering and production credits.

In 1970 he had a 56 channel mixing desk hand built by himself, Peter Lang and Michael Zähl. and went on to produce and/or engineered many recordings by significant German progressive/experimental music acts often referred to as krautrock internationally, including Kraftwerk, Organisation, Neu!, Cluster, Harmonia, Night Sun, Holger Czukay and Guru Guru.

In 1977, through Brian Eno, Plank recruited Dave Hutchins from Island Studios, as house engineer. Hutchins undertook recording and mixing roles on many of the productions originating from the studios in the following ten years.^{[citation needed]}

As a musician, Plank played guitar and keyboards on three Guru Guru albums: Kang Guru, Guru Guru, and Mani und Seine Freunde, the Os Mundi album 43 Minuten, and Cluster's self-titled debut album. In 1978 and 1979 he added guitar and percussion to two Roedelius solo albums, Durch Die Wüste and Selbstportrait. He was a member of the short lived band Liliental, contributing guitar, keyboards, and vocals. In 1979 he went into the studio with Dieter Moebius to record the first Moebius & Plank album, Rastakraut Pasta which was released the following year.

Plank continued to work as one half of the duo Moebius & Plank, recording four additional albums. Their second album, Material, was released in 1981. Their third album, the African-influenced Zero Set, with Guru Guru drummer Mani Neumeier, was released in 1983. These two albums are early examples of the predecessors of techno and electronica. In 1983, Moebius & Plank also recorded the album Ludwig's Law using an E-mu Emulator, an early form of sampling keyboard that enabled them to duplicate other instruments without having musicians to play them. Mayo Thompson of Red Krayola contributed vocals, mainly spoken monologues. The project was rejected by Sky Records and was not released until 1998. The final Moebius & Plank collaboration, En Route was recorded in Conny's Studio in 1986 but left incomplete as Plank's health deteriorated. It was completed and mixed in 1995, primarily by Dieter Moebius, and released that year.