Lehmann arrives at Hampshire on a deal that will keep him at the county for the next two years.
The left hander has previously played in England for Sussex and Yorkshire and is the eldest son of former Australia coach and current Northamptonshire head coach Darren Lehmann.
He plays for Adelaide Strikers in the BBL and has scored over 5,000 runs in first-class cricket for South Australia with 16 career centuries.
“Jake is in outstanding form and is the leading run scorer in Shield cricket over the past 18 months,” White added.
“With a British passport, he is eligible to play as a locally qualified player, allowing flex in strengthening the squad.
“Both players possess a great attitude and bring quality and experience; it’s a great boost as we look to finalise our plans ahead of 2026.”
