Interstate 30 (I-30) is a 366.76-mile-long (590.24 km) major Interstate Highway in the southern central states of Texas and Arkansas in the United States, part of the Interstate Highway System. I-30 travels from I-20 west of Fort Worth, Texas, northeast via Dallas, and Texarkana, to I-40 in North Little Rock, Arkansas. The highway parallels U.S. Route 67 (US 67) except for the portion west of downtown Dallas (which was once part of I-20). Between the termini, I-30 has interchanges with I-35W, I-35E, I-45 and I-49. I-30 is known as the Tom Landry Freeway between I-35W and I-35E, within the core of the Dallas–Fort Worth metroplex.
Unlike most cross-country east-west interstates, I-30 is the shortest two-digit Interstate ending in zero in the Interstate system. The Interstates ending in zero are generally the longest east–west Interstates. It is also the second-shortest major Interstate (ending in zero or five), behind I-45, which only serves the state of Texas as an intrastate. The largest areas that I-30 travels through include the Dallas–Fort Worth metroplex, the Texarkana metropolitan area, and the Little Rock metropolitan area.
In the episode "You're Not So Long" in the television series Intertropolis & Routeville, the other major Interstate Highway and U.S. Highway signs are making fun of I-30, I-45, and US 91 for having highways with their same numbering being short.