The former Australia coach, who quit the national team in the wake of the ball-tampering scandal, has extended his deal at the unfashionable county of Northamptonshire, tying himself to the Wantage Road outfit until 2029.
The 56-year-old joined Northants in October 2024 and quickly settled in.
Last year he led the county to Finals Day in the T20 competition, their first such appearance since winning the event, their last honour, in 2016.
Northants are one of the smallest counties in the 18-club English set-up, one of three never to have won the main white-ball competition, the County Championship.
They have been in the second tier for 20 of the 27 seasons since it split into two divisions but sit second this season with a chance of promotion.
Lehmann's presence has helped Northants secure four Australians this season: Nathan McSweeney, Harry Conway, Liam Guthrie and Chris Lynn.
"It was an easy decision for me because I love the place," said Lehmann.
"Everyone has made it such a family club for me, so I'm delighted to be carrying on here.
"We just want to keep improving and hopefully we represent the club proudly along the way."
"We're all thrilled to have secured Darren's services for another two years. It's been an excellent fit since his first day and he's taking the club in a really positive direction," said Northamptonshire CEO Ray Payne.
"Darren's transparency and connection with the supporters has made a notable impact and the excitement around what the following years could bring on the field is a testament to his work so far."
Lehmann was Australia head coach for five years from 2013, winning two Ashes series and the 2015 World Cup. The South Australian has also coached Queensland and Brisbane Heat
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