Webster has signed a deal to play for the Birmingham-based county from the beginning of next season until the last week of July 2026 after the club was left hugely impressed by his allround contribution this year.
The man from Snug enjoyed a three-month spell in the Midlands, never looking back after top-scoring for Warwickshire with 85 on debut as his side earned a five-wicket victory against Yorkshire at Headingley.
His spell helped him seal selection for Australia's World Test Championship final quest against South Africa at Lord's in June, when he also top-scored with 72 in the first innings.
After playing a further three Tests for Australia in the Caribbean, scoring two half-centuries and taking five wickets, the 31-year-old returned to Edgbaston last month, scoring a half-century and an unbeaten hundred as well as taking four wickets in Warwickshire's victory over local rivals Worcestershire.
In all, he amassed 361 runs at an average of 45.12 and took 16 wickets at 26.56 in the red-ball Championship, though the club will be hoping he plays some limited-overs games too next season.
"Beau has been a dream overseas recruit," Warwickshire first-team coach Ian Westwood told the club website.
"He is a triple-threat player of top international calibre, and we cannot wait to welcome him back next April. It's great news for the club and us as a team."
Webster himself added: "I have loved my time with the Bears in 2025.
"My teammates, coaching and support staff and Edgbaston facilities are absolute top tier, and it did not take me long to agree to return in 2026."
