Orhan Terzi (born 28 June 1964, in Turkey), better known by his stage name DJ Quicksilver is a German DJ and music producer. Terzi moved to Germany with his family in the late 1960s. His stage name derives from his days taking part in DJ contests, where a mercury column would gauge audience reaction.

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

In 1997 they released "Bellissima" a hit double A-sided single after contributions from Alice Deejays' Marc Lee-Smith. The song became a big hit on the UK dance charts 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.

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

In 2002, he received an ECHO nomination for "Best National Dance Act" for the single "Ameno".