"My first impressions have been top. I'm looking forward to getting started and helping the club get promoted," Campbell told Charlton's club website.
"I loved working with him before, so when the opportunity came up to sign him for Charlton I really wanted to bring him here," Jones added.
Campbell earned his solitary international cap for Scotland in their 4-1 Nations League win over Armenia in 2022.
The move signals the second time Campbell and Addicks head coach Nathan Jones will have worked together following the Welshman's second stint in charge of Luton.
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