Protest leader Suthep Thaugsuban vowed to keep up the struggle to topple Yingluck and keep her brother, former Prime Minister Thaksin Shinawatra, from returning to power.
Thaksin was ousted in a 2006 military coup, and Yingluck's rivals have repeatedly accused her of being Thaksin's puppet.
“You can rest assured that this is a victory that is only partial and not a complete victory because the tyrannical Thaksin government endures,” Suthep said. “We must continue fighting.”
The protesters have demanded that Yingluck's government hand over power to an unelected council that would appoint a new prime minister.
Thaksin remains central to Thailand's political crisis and is a focal point of the protesters' hatred.
He is despised by many of the mostly middle-class Bangkok supporters of the opposition Democrat Party for alleged widespread corruption and abuse of political power for his family's benefit.
The street battles, which followed a month of peaceful demonstrations, have hurt Thailand's image and raised concerns that prolonged unrest could damage the tourism industry ahead of the peak holiday season.
Three people died and more than 230 were injured after clashes erupted Saturday between protesters and police.
