Finnegan's television credits include VH1's Best Week Ever, his own half hour special Comedy Central Presents: Christian Finnegan, Premium Blend and regular appearances on The Today Show. He is also known as "Chad", the only white roommate in the infamous "Mad" Real World sketch on Comedy Central's Chappelle's Show. He is the host of TV Land's interstitial game show Game Time and was a writer for Tough Crowd with Colin Quinn on which he also appeared as a guest.

In Summer 2005, Christian Finnegan portrayed the supporting role of "Carl" in Eden Court.

In October 2006, Finnegan's debut stand up comedy CD titled Two For Flinching was released by Comedy Central Records.