The invention relates to a lumbar support (1) for a chair with a backrest comprising backrest carriers (7) which are pivotable independently of each other, wherein the lumbar support comprises support regions (10a, 10b) which are each mounted on a spring element (2). The spring action of each spring element (2) is individually adjustable. In this arrangement, the spring elements (2) are arranged on a carrier (5), which can be articulated to the backrest carriers (7) of the backrest of the chair, which are pivotable independently of each other. The invention further relates to a chair with a backrest, which is formed from backrest carriers (7) which are pivotable independently of each other and which also comprises the aforementioned lumbar support (1). In this case, the lumbar support (1) is articulated to the backrest carriers (7) which are pivotable independently of each other.