Texas State Highway 75
|Maintained by TxDOT|
|Length:||132.63 mi (213.45 km)|
|Existed:||1987 – present|
|South end:||Loop 336 in Conroe|
| I-45 / FM 1791 in Huntsville
US 190 in Madisonville
US 79 in Buffalo
US 84 in Fairfield
|North end:||FM 246 near Streetman|
State Highway 75 (SH 75) is a 132.63-mile-long (213.45 km) Texas state highway remnant of the old U.S. Route 75 (US 75). SH 75 retained the number as a state highway when Interstate 45 (I-45) supplanted US 75 south of Dallas except in Dallas, where old US 75 is now SH 310, and through Ferris, Palmer, Ennis, and Corsicana, where the old highway is signed as Business Route I-45. This route was designated in 1987.
- Southern terminus is in Conroe, where it merges into Interstate 45 at the southern side of Loop 336.
- Northern terminus is approximately three miles north of Streetman, in the southern section of Navarro County, where it becomes the east side frontage road for I-45.
SH 75 was previously designated in 1926 to replace SH 13A from Amarillo east to the Oklahoma border. By 1927 it was running concurrently with the newly designated U.S. Highway 66, and was cancelled by 1938.
North of Dallas, US 75 was rerouted onto Central Expressway, one of the first expressway projects in the United States, in the 1950s. Its original route from Richardson to Howe (south of Sherman) was redesignated as State Highway 5.
||This section contains a table that is missing mileposts for one or more junctions.|