Reef The Lost Cauze (born Sharif T. Lacey in 1981) is a prominent underground hip hop artist based in Philadelphia, Pennsylvania. Reef became well known on the underground circuit towards the late 1990s and more so in the early 2000s, making his mark by winning many battle competitions within New York and interstate and displaying rare skills of what many called true MCing.

Releasing The High Life album in 2001, Cauze moved on by teaming up with his past partners and friends and released The Invisible Empire in 2003 to much critical acclaim and thus establishing his name amongst many circles and true hip hop heads, as well as the underground. Feast or Famine was released in 2005 again to positive critical reception, as well as his side project, The Torture Papers, being part of the rap/hip-hop supergroup Army of the Pharaohs in 2006.

Reef is also part of hip hop underground groups; JuJu Mob & Army of the Pharaohs.