Thrasivoulos Zaimis was a Greek politician and Prime Minister.
Zaimis was born in Kerpini, Kalavryta on October 29, 1822, the son of Andreas Zaimis. He studied law in France and, in 1850, was first elected to the Hellenic Parliament. He served four terms as President of Parliament and also as Minister in several governments. In 1864 he was the representative of the Greek government who accepted the annexation of the Ionian Islands from the British.
Thrasivoulos Zaimis was the father of Alexandros Zaimis.