Arizona State Route 101

State Route 101 (SR 101) or Loop 101 is a semi-beltway looping around the Phoenix Metropolitan Area in central Arizona, United States. It connects several suburbs of Phoenix, including Tolleson, Glendale, Peoria, Scottsdale, Mesa, Tempe, and Chandler. Construction began in 1986 and was completed in 2002.

Loop 101 has three officially designated sections along its route:

Loop 101 begins as the Agua Fria Freeway at a three-level interchange with I-10 in Tolleson west of Phoenix. From that point, the route heads north entering Phoenix then Glendale, passing State Farm Stadium and Desert Diamond Arena. Continuing northward through Peoria, it encounters the Grand Avenue portion of US 60 and passes the Peoria Sports Complex before entering northwestern Glendale and curving east just past the Arrowhead Towne Center mall. The route then heads east along the Beardsley Road alignment, traveling through the community of Arrowhead Ranch. The freeway enters northern Phoenix, and at milepost 23, Loop 101 intersects I-17 15 miles (24 km) north of Downtown Phoenix.

Continuing east as the Pima Freeway, Loop 101 travels just south of Deer Valley Airport before intersecting the northern terminus of SR 51 at milepost 29. East of this junction, Loop 101 travels through Northern Phoenix, passing through Desert Ridge and passing by Desert Ridge Marketplace to its north, and Mayo Clinic to its south. The freeway then curves south through Scottsdale on the Pima Road alignment. The freeway then curves east and passes through the Salt River Pima-Maricopa Indian Community, just south of Via Linda providing access to Downtown Scottsdale, Scottsdale Pavilions, Scottsdale Community College, two casinos, and Scottsdale Fashion Square. Continuing south, Loop 101 encounters an interchange with the Red Mountain Freeway portion of Loop 202 in Tempe at milepost 51. This interchange is partially built over the Salt River.

Loop 101 then becomes the Price Freeway and continues south. Just south of the interchange, the freeway passes Tempe Marketplace to the east, and Sloan Park to the west. The freeway then passes Arizona State University to the east. At milepost 53, the freeway provides access to Apache Boulevard, and the Price–101 Freeway/Apache Boulevard park and ride light rail station, on Valley Metro's A Line. The route then intersects the Superstition Freeway portion of US 60 at milepost 55 before entering Chandler.

Loop 101 provides access to Chandler Fashion Center just prior to concluding at milepost 61 at an interchange with the Santan Freeway portion of Loop 202.

Loop 101 was a part of the 1985 Maricopa County Regional Transportation Plan that was funded by a sales tax approved by Maricopa County voters that year. The freeway was originally assigned two different route numbers along its path: The Agua Fria Freeway portion was initially designated as SR 417, and the Pima/Price Freeway portion was initially designated as SR 117. The Loop 101 designation was first assigned on December 18, 1987, at which time the South Mountain Freeway and the portion of the San Tan Freeway between I-10 and Price Road were also designated to be part of Loop 101. On July 19, 1991, the proposed South Mountain Freeway was renumbered as part of Loop 202. The San Tan Freeway portion of Loop 101 was only officially renumbered when its opening took place.

In 1990, after several years of negotiation with the Salt River Pima–Maricopa Indian Community, the state of Arizona paid the tribe $247 million for right of way for the nine-mile eastern leg of Loop 101 from Via Linda to the north bank of the Salt River. The resulting alignment kept all four corners of each interchange on tribal land, allowing the community to control and benefit from development. The tribe formed a development arm, Salt River DevCo, to manage these and other community developable properties.