Abstract: The boat seat fishing accessory attachment is configured for use with a vessel. The vessel is further defined with a seat. The seat if further defined with a stanchion, a bench, and a plurality of bolts. The plurality of bolts attach the bench to the stanchion. The boat seat fishing accessory attachment attaches to the seat. The boat seat fishing accessory attachment provides storage. The boat seat fishing accessory attachment provides storage for tackle used for angling activities, segregated bait storage for angling activities, and a beverage for hydration. The boat seat fishing accessory attachment comprises a mounting plate, a plurality of extension structures, and a plurality of lockers. The mounting plate attaches the boat seat fishing accessory attachment to the seat. The plurality of extension structures attach the plurality of lockers to the mounting plate such that the plurality of lockers are accessible from the seat.