In the United States, Diane Wittry has led performances by, among others, The Los Angeles Philharmonic, the Buffalo Philharmonic, Florida Philharmonic Orchestra, the Little Orchestra Society of New York, and the symphony orchestras of Milwaukee, San Diego, Houston, New Jersey, Santa Barbara, among others; while her international engagements include concerts with the Sarajevo Philharmonic in Bosnia, the National Symphony Orchestra of Ukraine, Russia's Maikop and Sochi symphony orchestras, Slovakia's State Orchestra-Kosice, Italy's Sinfonia Dell’Arte di Firenze, Canada's Niagara Symphony, and Japan's Orchestra Osaka Symphony. She has also conducted at the Ojai Music Festival as well as at the music festivals of Penn's Woods (PA), and I-Park (CT).