Bath have signed Australian number eight Leroy Houston from Colomiers and Argentina international tighthead prop Juan Pablo Orlandi from Racing Metro.
Houston, 26, moves to the Rec following a two-year spell in France, having previously won the Super 15 with Queensland Reds in 2011.
Orlandi, 29, arrives after a three-year stint with French club Racing.
"These are two very significant signings for Bath," head coach Gary Gold told the club website.
"Leroy [Houston] is a guy I have admired for a long time and we are delighted to have secured him. He's very dangerous with ball in hand and loves to hit hard in defence.
"Juan Pablo [Orlandi] is also a very powerful man. I spoke personally to the Pumas coach Santiago Phelan and he backed up our opinions, telling me that this guy is the real deal."