Christie didn't offer any details about his health in his tweet announcing his release.
"I am happy to let you know that this morning I was released from Morristown Medical Center," he said. "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 announced his hospitalization Oct. 3, the same day he learned about his coronavirus diagnosis.
It's unknown where, exactly, he picked up the virus, but he's one of several officials sickened in an outbreak linked to the White House.
He, along with former counselor Kellyanne Conway, and campaign manager Bill Stepien, helped President Donald Trump prepare for his first debate with Democratic presidential nominee Joe Biden, which was held Sept. 29. All four tested positive for the virus less than one week later.
Trump also was hospitalized for three days at the Walter Reed National Military Medical Center last weekend. He and his doctor said he's feeling better and he expects to resume public events later Saturday, with a speech to supporters at the White House.