A liner (10) for lining a microwave oven (M) to prevent food from adhering to the top (T), sides (R, L), and floor (F) of the microwave during the cooking of food. The liner has a top panel (12), and three side panels (18, 20, 22) which are initially folded in place with the top panel of the liner first being installed and then the other panels in a prescribed sequence. A two-sided tape (14) is used for adhering the panels to corresponding sides of the microwave. The liner further includes a panel (28) similarly installed on the floor of the microwave, this piece having a central opening which exposes the turntable installed in the floor of the microwave. A separate circularly shaped panel (30) attaches to the top of the turntable.