The former GCB star will have a recurring role on the CBS series later this year, according to Entertainment Weekly.
Chenoweth will play a news reporter who is writing about Peter Florrick's (Chris Noth) campaign. She will cross paths with Alicia (Julianna Margulies) when she investigates the pair's marriage.
The 43-year-old will make her debut in the season premiere.
It was reported on Monday (June 25) that ER actress Maura Tierney would be reuniting with former co-star Margulies on The Good Wife.
Tierney will play a self-made billionaire who is targeted as a source of funding for Peter's campaign.
Margulies recently described The Good Wife's shooting schedule as "inhuman".