The invention concerns a device (1; 100) for dispensing fluids (L), comprising means (3) for coupling it with a container (C; C) holding the fluid (L) and comprising: an outlet duct (63; 163) for the fluid (L); a collapsible chamber (60; 160) defined at least partially by an elastically yielding portion of an actuator element; first valve means (25; 125); second valve means (48; 148). One between said first valve means (25; 125) and second valve means (48; 148) comprises a movable element (47; 147, 157) belonging to the actuator element (40; 140). The invention concerns also a system for dispensing fluids (L), comprising a container (C; C) and a device (1; 100) as described above.