Wall cladding attachment element, which comprises a main body intended to be fixed to a wall and adapted to support a cladding element having a rear lateral flank provided with a first groove, which is defined by a corresponding first inner surface, and a lower flank provided with a second groove, which is defined by a corresponding second inner surface; said main body comprising: - a first wing, which is designed to be fixed to said wall and it is provided with a rear face, which is designed to be faced toward said wall, and with an opposite front face; - a second wing, which extends like a shelf from the front face of said first wing and it is provided with an upper face which delimits, with the front face of said first wing, a positioning cavity, such positioning cavity being designed to receive said cladding element arranged with said rear lateral flank facing toward the front face of said first wing and with said lower flank resting against the upper face of said second wing; wherein said main body is substantially L-shaped and it further comprises: - a first retention member, which extends protruding from the front face of said first wing along a first extension direction, - a second retention member, which extends protruding from the upper face of said second wing along a second extension direction, characterized in that said first and second retention members are configured to be elastically deformed at least traverse to said first and second extension direction (X,Y), respectively, and they are rHradapted to be engaged in compression in the first and second groove (102,104) of said cladding element, resspectively. - a first wing, which is designed to be fixed to said wall and it is provided with a rear face, which is designed to be faced toward said wall, and with an opposite front face; - a second wing, which extends like a shelf from the front face of said first wing and it is provided with an upper face which delimits, with the front face of said first wing, a positioning cavity, such positioning cavity being designed to receive said cladding element arranged with said rear lateral flank facing toward the front face of said first wing and with said lower flank resting against the upper face of said second wing; wherein said main body is substantially L-shaped and it further comprises: - a first retention member, which extends protruding from the front face of said first wing along a first extension direction, - a second retention member, which extends protruding from the upper face of said second wing along a second extension direction, characterized in that said first and second retention members are configured to be elastically deformed at least traverse to said first and second extension direction (X,Y), respectively, and they are rHradapted to be engaged in compression in the first and second groove (102,104) of said cladding element, resspectively. - a first retention member, which extends protruding from the front face of said first wing along a first extension direction, - a second retention member, which extends protruding from the upper face of said second wing along a second extension direction, characterized in that said first and second retention members are configured to be elastically deformed at least traverse to said first and second extension direction (X,Y), respectively, and they are rHradapted to be engaged in compression in the first and second groove (102,104) of said cladding element, resspectively.