Laminar-flow operating theatre that comprises a support (4) that defines a horizontal plane, on which the patient (2) rests, which has a main longitudinal direction, on which support (4) there is, in addition, an operating region (R), laminar-flow-emitting unit (5) and an air-absorption unit (6), wherein the laminar-flow-emitting unit (5) emits the laminar flow in a horizontal direction which is oblique with respect to the longitudinal position of the support (4) such that said direction of incidence of the flow reaches the operating region (R) for the patient (4), and the air-absorption unit (6) is in a horizontal absorption direction which is oblique with respect to said longitudinal direction of the patient's support (4).