Charley Rowley, 45, left Salisbury District Hospital on Friday, Chief Const.
"I am pleased to confirm that earlier today, Charlie Rowley was discharged from hospital", Lorna Wilkinson, Director of Nursing, Salisbury NHS Foundation Trust, said in a statement.
The poisoning is thought to be linked to the attack on Russian ex-spy Sergei Skripal and his daughter Yulia, who were discovered slumped on a bench on 4 March in nearby Salisbury.
'Today is a very welcome milestone in his recovery and all of us at Salisbury Hospital wish him well as he continues to get better.
Ms Sturgess later died on 8 July and a murder inquiry has been launched.
LONDON-Nerve agent victim Charlie Rowley has been released from the hospital after three weeks of treatment since being poisoned, United Kingdom officials said Friday.
'Charlie has been through an appalling experience most of us could never imagine.
On Wednesday, global chemical weapons experts completed their investigations in Amesbury, where they sought to identify whether the substance that poisoned the couple was from the same batch used against the Skripals.
"They are sure the (suspects) are Russian".
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The second round of nerve agent poisonings put the towns of Amesbury and Salisbury, where Sturgess lived, on edge as more than 100 counterterrorism officers searched for the source of the Novichok.
Britain and its allies blamed Russia for the attack in March on the Skripals, prompting the biggest Western expulsion of Russian diplomats since the Cold War.
Wilkinson said that while Rowley had been discharged, it was a "day tinged with sadness for everyone" as they remembered Sturgess.
The Skripals survived and were released from the Salisbury hospital before Mr Rowley and Mr Sturgess were poisoned and taken there.
They were treated for exposure to the nerve agent and discharged separately from the hospital several weeks later.
Paul Cosford, Director of Health Protection and Medical Director at Public Health England, said Mr Rowley's release "creates no risk to anyone in the community - our advice remains unchanged".
Police say the source of the Novichok which killed Sturgess was a small bottle they found in Rowley's house.
The Organisation for the Prohibition of Chemical Weapons (OPCW) will analyse the substance before reporting back its conclusions.
An inquest into the death of Sturgess opened on Thursday in Salisbury and was adjourned until a pre-inquest review on January 16, pending further investigation.