State Highway 249, SH 249, the Tomball Parkway, or West Mount Houston Road is a generally north–south highway in Southeast Texas. The current northern terminus of the highway is in Pinehurst at the intersection of FM 1774 and FM 149. The Southern terminus is in North Houston at Interstate 45.

The section of Texas State Highway 249 north of its junction with Beltway 8 is referred to by area residents as the Tomball Parkway because it leads to and is the main road through Tomball, Texas. Along the east-west section between I-45 and West Montgomery, it is called West Mount Houston Road. West Mount Houston Road, however, actually extends east past the intersection of SH 249 at I-45, and extends west past W. Montgomery, when SH 249 curves to the northwest.

Originally a part of FM 149, the highway was given the designation of SH 249 in 1988. The highway's importance grew after Compaq Computer Corporation (now known as Hewlett-Packard) moved its headquarters close to the intersection of SH 249 and Louetta Rd. In 2003, a portion of SH 249 in Tomball was renamed BS 249-B from Hicks Road to Holderreith Road. This is due to a bypass that bypasses Tomball on the west side of the city.

Previously, SH 249 was designated between 1936 and 1938 from then-SH 73 (now Interstate 10) near San Felipe north to the Brazos River. The route was redesignated in 1940 as Texas Spur 99. The route is now part of Farm to Market Road 1458.

Current plans call for the highway to extend to the Bryan – College Station area. Upon completion, the highway will be named "Aggie Expressway", after Texas A&M University in College Station. Recently funding for a two phase extension of SH 249 as a tollway with 3 lanes in each direction has been approved . Phase one would run from just north of Spring Cypress Road, the current terminus of the existing free lanes to just north of the existing Tomball bypass. The existing lanes would become frontage roads and not be tolled. Phase two will extend the tollway into Montgomery County to FM 1774. This $335 million project will be overseen by the Harris and Montgomery County toll road authorities. Construction of phase one is scheduled to start in fall 2013, likely in parallel to the construction of SH 99 phases F-1 and F-2. SH 99, the Grand Parkway, will intersect SH 249 around Boudreaux Road.

Further plans currently call for a bypass of Magnolia, Texas on its eastern side because of the large traffic load every October when it holds the annual Renaissance fair; instead it would run close to or through Plantersville, Texas.

The Eli Young Band references "highway 249" in their song 'Always the Love Songs'. Several of the band grew up in Tomball, right off Texas State Highway 249.