The paint brush guide with swivel mounted secondary guide plate has handle clip or strap to removably attach to the brush handle. First and second elevated plates are disposed above and at an acute angle from the 3-D paint brush plane. A swivel mounted secondary guide plate on the second elevated plate has a distal guide edge operable in first and second guide positions, defined as first and second extreme obtuse cut-in angles for the paint brush. These first and second cut-in angles are on opposite sides of the longitudinal centerline of the paint brush. Further, the first and second elevated plates are longitudinally twisted or rotated over the 3-D brush plane. The second elevated plate form an A-shape forward edge. A hinge between the first and second elevated plates permit flexation. Stops can limit the rotation of the swivel mounted secondary guide plate.