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- Zach Wells Traded from Houston Dynamo for Bobby Boswell
- Ryan Cordeiro Drafted 33rd overall in 2008 MLS Superdraft
- Franco Niell Loan from Argentinos Juniors
- Gonzalo MartÃnez From Millonarios
- Marcelo Gallardo From Paris Saint-Germain
- José Carvallo Loan from Universitario de Deportes
- Gonzalo Peralta Acquired from Club Almirante Brown
- Dan Stratford Drafted 24th overall in the 2008 MLS Supplemental Draft
- James Thorpe Drafted 52nd overall in the 2008 MLS Supplemental Draft
- Quavas Kirk Acquired from Los Angeles Galaxy for Greg Vanney
- Pat Carroll Signed as a discovery player
- Santino Quaranta Signed as a free agent from New York Red Bulls
- Jeff Curtin Picked up in waiver draft from Chicago Fire
- Jeremy Barlow Traded from Houston Dynamo
- Dane Murphy Signed after a successful trial
- Mike Zaher From Toronto FC
- Francis Doe Free agent
- Craig Thompson From Houston Dynamo
- Joe Vide Free agent
- Ivan Guerrero Traded from San Jose Earthquakes for partial allocation
- Louis Crayton From FC Basel
- Thabiso Khumalo Acquired from Pittsburgh Riverhounds
- Greg Janicki Acquired from Pittsburgh Riverhounds
- Ibrahim Koroma Acquired from Kallon F.C.
- Ryan Miller Acquired off waivers from Columbus Crew
Read more about this topic: List Of Major League Soccer Transfers 2008, D.C. United