55 Cancri f, also designated Rho¹ Cancri f and named Harriot, is an extrasolar planet approximately 41 light-years away from Earth in the constellation of Cancer. 55 Cancri f is the fourth known planet from the star 55 Cancri and the first planet to have been given the designation of "f".

Discovered: November 6, 2007

Distance to Earth: 40.12 light years

Orbital period: 260 days

Orbits: 55 Cancri

Star: 55 Cancri A

Temperature: 200–300 K (−73–27 °C; −100–80 °F)