KNSD, virtual channel 39 (UHF digital channel 17), is an NBC owned-and-operated television station licensed to San Diego, California, United States. Owned by the NBC Owned Television Stations subsidiary of NBCUniversal (itself a subsidiary of Comcast), it is sister to Poway-licensed Telemundo owned-and-operated station KUAN-LD (channel 48). The two stations share studios on Granite Ridge Drive in the Serra Mesa section of San Diego and transmitter facilities southeast of Spring Valley.

KNSD's on-air branding, NBC 7 San Diego, is derived from its cable channel position in the market on Spectrum, Cox Communications and AT&T U-verse. The station is also available on channel 39 on satellite providers DirecTV and Dish Network.