The 28-year-old has signed a three-year deal with the Rams
Derby have signed Ipswich striker Martyn Waghorn on a three-year deal.
The 28-year-old forward joins for an an undisclosed fee and could now make his Rams debut at home to Leeds on Saturday.
“I’m delighted to see Martyn Waghorn become a Derby County player – I think this is a big signing for us,” manager Frank Lampard told the official club website.
“He has been sought-after all summer and we’ve managed to bring him here, which is fantastic.
“We sold the club to him and, importantly, he wanted to come here and that’s the sort of player that I want in the squad.
“Martyn has many great qualities and he has been pretty prolific over the last few years in front of goal.
“He is a real all-round striker and last year we saw not only could he score goals in the Championship but create them as well.”
Waghorn becomes new boss Lampard’s seventh summer signing after adding Mason Mount, Harry Wilson, Florian Jozefzoon, Jack Marriott, George Evans and Fikayo Tomori to his squad.
Waghorn, a former England Under-21 international, scored 16 goals for Ipswich last season after joining from Rangers in the summer of 2017.
He scored 44 goals in 78 games for Rangers between 2015 and 2017 and has also played for Sunderland, Hull, Charlton, Millwall, Wigan and Leicester.
“I was excited by the project and where the club’s going, and I wanted to be part of it,” Wahgorn told Rams TV.
“Derby have been up and around it (promotion) the last few seasons.
“Hopefully we can push the club forward where we want to be and that’s in the Premier League.”