The soldiers' names have not been released as next of kin have not yet been notified. No other casualties were reported.
The two soldiers were members of the 101st Airborne Division's 101st Combat Aviation Brigade.
Acting senior commander, Todd Royner, issued a statement calling the tragedy a day of sadness for the 101st airborne. Two soldiers have been killed in the crash, which occurred during routine training and is now under investigation.
Just before 10 p.m., according to a 101st Airborne Division spokesperson, an Apache attack helicopter went down in the darkness on the sprawling Army post.
The crash is the latest in a series of similar incidents involving US military aircraft that began on Tuesday.
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Fort Campbell Fire and Emergency Services are on site and recovery operations are ongoing.
"Our thoughts and prayers are with the families during this hard time".
A Marine jet also crashed in Djibouti on Tuesday. The pilot ejected from the plane before impact and survived the crash.
And the next day, an Air Force fighter pilot died in a crash in Nevada.
The two deceased were the only people on the helicopter. The Army explained that the incident was under investigation.