A living room or lounge room (informal: lounge) is a room in a residential house for relaxing and socializing. Such a room is sometimes called a front room when it is near the main entrance at the front of the house. The term sitting room is sometimes used synonymously with living room, although a sitting room may also occur in a hotel or other public building. The term living room was coined in the late 18th or early 19th century.

In homes that lack a parlour or drawing room, the living room may also function as a reception room.

A typical Western living room may contain furnishings such as a sofa, chairs, occasional tables, and bookshelves, electric lamps, rugs, or other furniture. Traditionally, a sitting room in the United Kingdom and New Zealand has a fireplace. In a Japanese sitting room, called a washitsu, the floor is covered with tatami, sectioned mats, on which people can sit comfortably.

In larger homes in the United States and Canada, the living room may be reserved for more formal and quiet entertaining, while a separate room—such as a den, family room, or recreation room is used for leisure and informal entertainment. A great room combines the functions of one or more of these rooms.