Janaka (Sanskrit: जनक; Sinhala: ජානක) is a name primarily found in Sri Lanka. Notable people with this name include:
Janaka is the father of Sita, the wife of Rama in the ancient Indian epic Ramayana.
Janaka Perera, Sri Lankan politician
Janaka Ratnayake, Sri Lankan entrepreneur
Janaka Kumbukage, Sri Lankan actor
Janaka Ruwanpura, professor at the University of Calgary, Canada
Janaka Stucky, American poet
Janaka de Silva, Sri Lankan physician
Janaka Walgama, Sri Lankan Army officer
Janaka Bandara Tennakoon, Sri Lankan politician
Janaka Wakkumbura, Sri Lankan politician