State Highway 305 (SH 305) is a Texas state highway that runs from just east of Darrouzett south to Glazier in the far northeastern Texas Panhandle.

It heads north from this junction to an intersection with SH 213.

Heading towards the north, the highway continues to an intersection Spur 108 in Lipscomb.

[2] SH 305 was designated on December 1, 1938, in its general present location.

The highway was lengthened on September 1, 1988, due to the removal of the concurrency with SH 213.