Dr. Elon Thompson, Delano Seiveright and Marlon Morgan were on Thursday afternoon sworn in as government senators.
Prime Minister Dr. Andrew Holness announced on Wednesday that he had written to Governor-General Sir Patrick Allen, recommending the appointments.
Vacancies were created following the resignation of four government senators - Don Wehby, Matthew Samuda, Delroy Williams and Ransford Braham.
There is still one vacancy to be filled to complete the slate of 13 senators on the government side.