Harmon recorded 16 tackles, including 1.0 sack, two passes defensed and one interception in four regular-season games for the Browns in 2023.
Harmon was waived by the Bears on Wednesday.
The Bears signed Harmon off of Baltimore's practice squad Tuesday.
Baltimore signed Harmon to the practice squad Tuesday, Jeremy Fowler of ESPN.com reports.
Harmon wrapped up his 2022 campaign with 86 total tackles (63 solo), five passes defensed, two interceptions, two forced fumbles and a touchdown in 17 games.
Harmon recorded nine tackle (eight solo) during Sunday's 37-34 loss to the 49ers.
Harmon recorded seven tackles and one pass defensed during Sunday's 40-34 overtime win over the Seahawks.
Harmon registered eight tackles (five solo) during Sunday's 27-20 loss to the Jaguars.
Harmon registered six tackles (five solo) and an interception, which he returned for a touchdown, during Sunday's 38-20 win over the Texans.
Harmon signed with the Raiders on Thursday.