In Speak, the 1999 novel by Laurie Halse Anderson, the protagonist, Melinda Sordino, suffers from selective mutism.
In A Nightmare on Elm Street 3: Dream Warriors the character Joey Crusel is selectively mute, his scream kills Freddy. In the sequel he appears to be over it.
Zeke Kinski, a character in the Australian show Neighbors is selectively mute as he thought he killed his father by wishing that he was the one who died instead of his mother, but when his sister was electrocuted by a faulty kitchen appliance, Zeke was forced to speak to an emergency operator and has since resumed speaking as normal.
In the Disney Channel original series Lizzie McGuire the character Lanny Onassis, a friend of Matt McGuire, is selectively mute and only communicates to Matt.
The song "She's Given Up Talking" by Paul McCartney (from the album "Driving Rain") conforms almost perfectly to a clinical description of selective mutism in childhood, describing a young girl who is mute at school yet normally talkative at home ("When she comes home it's a yap yap yap/ words start to flow like water from a tap")