A catalytic combustor which can prevent spark ignition pollution without increasing the pressure in the catalytic combustor through structural isolation between a chamber and an igniter, and a fuel reformer having the same are disclosed. A catalytic combustor may include a housing having a cylindrical chamber, a first opening disposed at one end part of the chamber, a second opening for discharging an exhaust in the chamber, and an auxiliary channel for connecting the chamber and the second opening. A catalyst may be disposed in the chamber. When the length direction of the chamber corresponds to a gravitational direction, an igniter may be disposed apart from a virtual extension volume of the chamber extending in the gravitational direction and positioned at a lower portion of the housing.