Orhan Terzi (born 28 June 1964), better known by his stage name DJ Quicksilver, is a German-Turkish DJ and music producer. His stage name derives from his days taking part in DJ contests, where a mercury column would gauge audience reaction.

Terzi was born on 28 June 1964 in Trabzon, Turkey. His family moved to Hattingen, Germany in the late 1960s.

He began working with Tommaso de Donatis on DJ Quicksilver material, and released tracks for a variety of record labels, including Avex Trax, Positiva Records, Telstar, Edel AG, Alphabet City, and Sub Terranean.

In November 1996, he released "Bellissima" - a hit double A-sided single. The song became a big hit on the UK dance charts in 1997 and then crossed over into pop, reaching #4 on the UK Singles Chart and selling enough copies to become a gold record, selling well throughout Europe. It remains his biggest single so far. Other releases include "Boombastic", which sampled the Shaggy track.

In 1999, under the alias "Watergate", Terzi released the track "Heart of Asia" (remix of Merry Christmas, Mr. Lawrence's theme song), among others. In 2002, he received an ECHO nomination for "Best National Dance Act" for the single "Ameno".

Terzi has also worked as a remixer, on tracks by Ian van Dahl, Faithless, and The Verve ("Bittersweet Symphony").