"This sentence will have a chilling effect on freedom of expression in Pakistan. It is appalling that someone should be sent to prison for decades over a TV programme," said David Griffiths, Amnesty International's Deputy Asia Pacific Director.
Griffiths said the "judgment shows how Pakistan's deeply flawed blasphemy laws have become another tool to silence media."
Mir Shakil-ur-Rahman, owner of Geo and Jang group, was handed down the prison term in absentia for allowing the broadcast of a "blasphemous programme" by Geo TV in May.
Geo TV has had tense relationships with Pakistani authorities and was temporarily taken off air earlier this year following the blasphemy allegations.
It has been locked in a standoff with authorities after its main anchor Hamid Mir in April accused the Inter-Services Intelligence of being behind an assassination attempt on him.
Amnesty said: "There are also serious concerns about the fairness of this trial as the defendants were sentenced in absentia and never had the opportunity to answer the charges in court."
Amnesty has urged Pakistan to reform the laws as a matter of urgency to provide effective safeguards against their abuse, with a view to their eventual repeal.
