Bumper for motor vehicle

The motor vehicle bumper (10) has a decoupling device (28) with first and second force transfer elements (22, 24) that can be displaced relative to each other in the force direction, a locking device (26) that locks the first and second force transfer elements relative to each other and an unlocking device (30) that removes the locking between them and allows a relative movement between them. Independent claims are also included for the following: (a) a bumper assembly; and (b) a motor vehicle with an inventive bumper.