State Highway 304 or SH 304 is a Texas state highway that runs in a north-south direction between Bastrop, Texas, and Gonzales, Texas. The highway's current route was in place by 1939.

SH 304 begins at a junction with SH 97. It heads north from this junction to an intersection with I-10. The highway continues to the north to an intersection with US 90. Heading towards the north, the highway continues to an intersection FM 713. The highway continues to the northeast to an intersection with FM 535. It continues to the north to a junction with FM 2571. SH 304 reaches its northern terminus at SH 21 and SH 71 in Bastrop.

The fictional Gulf Oil gas station/barbecue joint seen in the 1974 cult classic horror movie, The Texas Chain Saw Massacre, is located on the highway south of Bastrop at 1073 SH 304, Bastrop, TX 78602. In the movie, the establishment remains nameless but is donned with a "Coca-Cola/We Slaughter Barbecue" sign.

Today, the dilapidated grocery store (and former gas station ‒ its two gas pumps as seen in the movie having since been removed) sits unused and has been closed down for several years. Before its closure, it was known as Bilbo's Texas Landmark and before that as Ryan's Hills Prairie Grocery.