The Angry Boy (Norwegian: Sinnataggen) is a sculpture in the Vigeland installation in Frogner Park, Oslo.
It depicts a small, angry boy and is considered Gustav Vigeland's most famous sculpture.
"The Angry Boy" is positioned on the corner of the central section facing south.
His son inherited this sculpture and made at least ten additional, unauthorized "junior casts" of the same figure.
Over time, "Sinnataggen" became a popular postcard motif among tourists and a sort of mascot for the city of Oslo, similar to the iconic sculptures "The Little Mermaid" in Copenhagen and "Manneken Pis" in Brussels.