Tteokguk (Korean: 떡국) or sliced rice cake soup is a traditional Korean dish eaten during the celebration of the Korean New Year. The dish consists of the broth/soup (guk) with thinly sliced rice cakes (tteok). It is tradition to eat tteokguk on New Year's Day because it is believed to grant the people good luck for the year and gain a year of age. It is usually garnished with thin julienned cooked eggs, marinated meat, gim (김), and sesame oil (참기름).

Guk (국), also sometimes known as tang, is a class of soup-like dishes in Korean cuisine. Guk and tang are commonly grouped together and regarded as the same type of dish, although tang can sometimes be less watery than guk. It is one of the most basic components in a Korean meal, along with bap, and banchan. In Korean table setting, guk is served on the right side of bap (rice), and left side of sujeo.