Portable boat seat mounting system

A portable boat mounting device configured to be secured to a fixed seating area of a boat, is described. The portable mounting device includes a swivel seat assembly affixed to one or more mounting brackets. The swivel seat assembly includes a seat base affixed to one or more mounting brackets. The swivel seat assembly includes a mounting plate, affixed to the seat base forming a connection to each other with a rotational relationship about a common axis. The mounting plate includes a plurality of mounting slots configured to receive a fastening device. The mounting plate includes a seat base comprising one or more mounting slots configured to receive the fastening device.