Caretaker premier Anutin Charnvirakul was preparing for coalition talks Monday after a stunning election victory for his Bhumjaithai Party.
Bhumjaithai was forecast by Channel 3 to have won almost 200 seats in Sunday's vote, well ahead of others but short of an outright majority in the 500-member Lower House.
The progressive People's Party trailed at a little above 100 seats, while jailed former prime minister Thaksin Shinawatra's Pheu Thai party came in third.
Pheu Thai is seen as a likely coalition partner for Anutin.
Anutin, who took office in September, would not discuss coalition talks on Sunday, noting the election results remained unofficial.
One political analyst expected Bhumjaithai to "move quickly" to form a government in which its interests would prevail.
