A multilayer ceramic capacitor includes: a ceramic body including dielectric layers and having first and second surfaces opposing each other, third and fourth surfaces connecting the first and second surfaces to each other, and fifth and sixth surfaces connected to the first to fourth surfaces and opposing each other; a plurality of internal electrodes disposed in the ceramic body, each exposed to the first and second surfaces and having one ends exposed to the third or fourth surface; and a first side margin portion and a second side margin portion disposed, respectively, on the first and second surfaces of the ceramic body, wherein a metal or a metal oxide is disposed in each of the first and second side margin portions, and a ratio of a diameter of the metal or the metal oxide to a thickness of the dielectric layer is 0.8 or less.