Cameron Dummigan is the fourth player to join Derry City from Dundalk since the end of last season.
Dummigan, 25, has moved to the Candystripes on a two year deal after leaving Oriel Park.
The former Northern Ireland under-21 international was previously with Cliftonville, Burnley and Oldham, before joining Dundalk in 2019.
“I’m delighted to welcome a player of Cameron’s quality and versatility to the club," said Derry boss Ruaidhri Higgins of the versatile defender.
"It is very rare that a player is equally effective in a number of positions, but that’s certainly what he brings us.
“He has a wealth of experience behind him and is still only 25 years old so I would like to think he’s joining the club with his best years ahead of him.”
Higgins has already brought Patrick McEleney, Michael Duffy and Will Patching to the club from Dundalk.
Meanwhile, Brandon Kavanagh, who was on loan to Bray Wanderers from Shamrock Rovers last season, has also joined Derry.
Kavanagh was Bray's joint top scorer last term and joins his Bray and Ireland under-21 team-mate, Brian Maher, on Foyleside.
A statement from Rovers read: "We would like to thank Brandon for his commitment and professionalism during his time at Tallaght Stadium and wish him all the very best in his future career."
Higgins remarked: "I think he's coming at the right time. He's excited to come here too and be part of it."
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