Harding, a native of Baltimore, Md., posted a 3-6 record last year at 197-pounds and has a career mark of 50-28. He transferred to WVU from Virginia last summer.
"Martius is very excited about coming back and pursuing his goal of winning a national championship," WVU coach Craig Turnbull said. "From a coaching perspective last year, we believe he needed just one more season to turn his dream into a reality. We're very excited for Martius. Our compliance office did a great job."