Wicketkeeper Ambrose has signed a new one-year deal, while Sidebottom and Thomson have extended their contracts until 2021
Warwickshire have announced that Tim Ambrose, Ryan Sidebottom and Alex Thomson have all agrred to extend their stay with the county.
Wicketkeeper Ambrose, 36, is one of Warwickshire's longest-serving players after making his debut in 2006 and has signed a one-year deal with the club to see him through to the end of the 2020 season.
Meanwhile, Australian fast bowler Sidebottom, 30, and allrounder Thomson, 25, have agreed contracts until 2021.
"It's a welcome boost for the club to secure new deals with players of the calibre of Tim, Ryan and Alex," said Warwickshire sport director Paul Farbrace.
"Tim continues to be one of the leading wicket-keepers in the domestic game and will go down as a true Warwickshire great when he eventually hangs up his gloves. One of our recent priorities has been to support his workload so that he can continue to play a lead role and support our young players coming into the game.
"Ryan has had some bad luck with injuries, but he's a match winner and he has made a big impact for us in the first class game since he was discovered in the Birmingham League. Having him back at full fitness and raring to go in the 2020 season will be a great asset for the team.
"Alex is a very impressive young man who works tirelessly across all areas of his game. He gave an excellent account of himself in this year's One-Day Cup, bowling his full allocation of overs in the majority of games, but also making important contributions with the bat. He has an important role to play across all formats moving forward."