Is there caffeine in decaf coffee?

Yes, decaf coffee does have minuscule amounts of residual caffeine. However, to be labeled decaf, the coffee must be 99.9% caffeine free.  An 8 oz cup of decaf typically has 2-5 mg of caffeine, compared to an 8 oz cup of caffeinated coffee that can have 95-265 mg of caffeine. 

Learn more about decaf coffee here.