Jimi Pääkallo (real name Konstantinos (Konsta) Jorma Hiekkanen, b. December 31, 1981) is the singer and guitarist of the Finnish rock-band Technicolour. He was previously a member of Tyrävyö and Cliché. He is also an actor having appeared in the movies Pitkä kuuma kesä and Helmiä ja sikoja.

He is noted for his effiminite rocker image similar to that of Michael Monroe of Hanoi Rocks. He is a self-proclaimed vegetarian. He also filmed an extremely popular commercial-insert for the now defunct MoonTV cable-channel: "MoonTV on siit hyvä, että se on ihmisten tekemä" (MoonTV is good because it's made by humans). He was also a great supporter of the channel. He later filmed a commercial insert for the channel's cooking-show Musta Pippuri and featured as one of its guests.