State Road A19A (SR A19A) was a highway loop in the southern portion of Pinellas County, Florida.

From St. Petersburg to St. Pete Beach, A19A comprised the entirety of SR 682 as part of the Pinellas Bayway toll road.

From St. Pete Beach, A19A followed and the entirety of SR 693 (75th Street (St. Pete Beach), South Pasadena Boulevard and 66th Street (St. Petersburg)), going northward until it reaches its terminus at US 19 in Largo, between SR 686 (East Bay Drive / Roosevelt Boulevard) and SR 688 (Ulmerton Road).

Cities and communities served by A19A included (from north to south): St. Petersburg, St. Pete Beach, South Pasadena, Kenneth City, Pinellas Park and Largo.

Despite the similar numbering, comparisons with SR A1A can lead to faulty conclusions.