The 27-year-old joins the Addicks from Scottish Women's Premier League side Glasgow City, and has penned a deal with the Addicks until 2027.
Speaking after putting pen to paper, Lockwood said: “I am buzzing to be here, it’s a new challenge for me and I am really excited.”
"I have a lot of experience from the different countries that I have played in, so I am hoping that I can bring that here to Charlton and to the league this year."
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