Duckett has featured in all three formats for Northants this season, scoring 414 runs in this year’s T20 Blast, including 88 against Notts Outlaws, at an average of 29.57.
The destructive left-hander also has 2,049 career runs in List A cricket at an average of 40.98 and 4,510 career First Class runs to date.
Kent-born Duckett comes with international prestige after featuring for England in both test and ODI fixtures in 2016.
After completing his move to Trent Bridge, Duckett was relishing the chance to get going at such a prestigious venue.
“I’ve had 12 fantastic years at Northants, who I can’t thank enough for all the support they have given me, and their understanding about my move,” said Duckett.
“I felt I needed a new chapter, a new challenge to stretch myself and get the most out of my game. Trent Bridge is an incredible ground and the squad has an unbelievable amount of talent.
“I want to push myself, learn as much as a I can test myself against some of the best players in the country
“I want to focus on becoming the best player I can be, and believe Nottinghamshire is the best place for me to do that. I can’t wait to get started.”
And added: “I’m excited to joining up with the squad at the end of the season and call a place such as Trent Bridge my home.
“There’s such a talented squad here and I can’t wait to test myself against some of the best players in the country.
“The club has had a good season so far in reaching the knockout stages in both white ball competitions and going well in the Championship, and I hope I can help achieve even more next year.”
Duckett becomes the second new addition to the Notts batting line-up in as many weeks following the signing of Ben Slater from Derbyshire and director of cricket Mick Newell believes the batsman will be a valued addition when he joins the squad from the 1st October.
“We’re really excited to have signed an all format player such as Ben who still has a great deal of potential,” said Newell.
“We believe Ben can be a key asset for the club moving forward and we hope we can work with him to reignite his international ambitions by seeing the best of him in a Notts shirt.
“He’s a great talent and we can’t wait for him to get started with us.”