Kathleen Herles (b. 1990) is a former actress who was the original voice of Dora on Nickelodeon's Dora the Explorer, and its spin-off Go, Diego, Go!, from 2000 through 2009. She was succeeded in the role by Caitlin Sanchez and Fátima Ptacek.
Herles also notably appeared on Sesame Street. She was a credited child extra in the home video Let's Make Music, as one of the many kids seen in the finale.
She also appeared in Episode 3908, later released on video as Computer Caper. Though uncredited in the latter, she is named in dialogue. Kathleen is seen typing on a computer in the library, and is suspected by Telly Monster as the mystery friend who plays an email guessing game and speaks two languages. Although Telly finds that Kathleen is not the mystery friend, it's noted that she speaks English and Spanish.