A post for balusters, railings and similar, comprising a tubular body (4), provided with a lower end (5) suitable for being fixed to a floor, a step of a staircase (3) or another similar surface, and an upper end (6), the post (1) also comprising a rotary joint (7) associated with the upper end (6) and comprising a first member (8) able to be connected to the upper end (6), and a second member (9) able to be connected to a handrail (11) of a banister (2); the first member (8) and the second member (9) respectively comprise a first tang (16) able to be inserted in the cavity of the upper end (6) of the tubular element (4), and a second tang (17) able to be inserted in the cavity opening of the free end (10) of the handrail (11); the first member (8) and the second member (9) are identical and interchangeable.