The 76-year-old tycoon remade and dominated Thai politics for a quarter-century, but his influence has waned of late following his jailing and his once formidable Pheu Thai Party's worst election performance on record earlier this year.
As he left Bangkok's Klong Prem prison with hair closely cropped and wearing a loose white shirt, a smiling Thaksin hugged family members, including daughter and protégé, Paetongtarn Shinawatra, who a court sacked as prime minister in August, 10 days before his incarceration.
Hundreds of supporters, many wearing his party's signature red colour, who had gathered to greet him on his release on Monday chanted: "We love Thaksin".
Asked by a reporter how he felt, Thaksin raised his hands above his head and said he was "relieved".
"I went to hibernate. I can't remember anything now," he said.
After 15 years in self-exile, Thaksin came back to Thailand in 2023 to serve an eight-year sentence for conflicts of interest and abuse of power while prime minister from 2001-2006, returning on the same day a party ally was elected premier by parliament.
But without spending a single night in prison, he was transferred to the VIP wing of a hospital complaining of heart trouble and chest pains. His sentence was later commuted to one year by the king and Thaksin stayed in hospital for six months before being paroled.
The Supreme Court, however, ruled he and his doctors had dragged-out his hospital stay with minor and unnecessary surgeries, and that time be served again in prison.
Throughout his exile and for much of his time back home, the polarising tycoon loomed large over Thailand's tumultuous politics and was the driving force behind successive populist governments led or controlled by the powerful Shinawatra family.
But the removal of Paetongtarn, the sixth premier from or backed by the family to be toppled by courts or coups, was the start of a political reckoning for Thaksin, with the Pheu Thai government collapsing and ally-turned-foe Anutin Charnvirakul installed as premier just days before Thaksin was jailed.
Thaksin is required to wear an electronic ankle monitor until his sentence finishes in September.
