"I am happy to let you know that this morning I was released from Morristown Medical Center," Christie tweeted Saturday morning.
Christie said he will have more to say about his experience next week.
"I want to thank the extraordinary doctors & nurses who cared for me for the last week. Thanks to my family & friends for their prayers. I will have more to say about all of this next week," Christie tweeted.
The former governor was among several people who attended a Rose Garden ceremony on Sept. 26 for Judge Amy Coney Barrett, President Donald Trump's Supreme Court nominee, and contracted the virus.
He was also among a number of people who tested positive and were part of the president's debate preparations.
It's not clear, however, that they were infected during those events.
It was a week ago that Christie tweeted he tested positive.
Former NJ governor Chris Christie checks himself into hospital following COVID-19 diagnosis
"I just received word that I am positive for COVID-19. I want to thank all of my friends and colleagues who have reached out to ask how I was feeling in the last day or two," Christie said on Oct. 3.
Hours later, he posted that he checked himself into the hospital after consulting with his doctors.
"While I am feeling good and only have mild symptoms, due to my history of asthma we decided this is an important precautionary measure," he tweeted last week.
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The Associated Press contributed to this report