The Phoenix Subdivision is a railroad line in the U.S. state of Arizona owned by the BNSF Railway.

It runs from Phoenix in the south to Williams Junction in the north where it connects to the Seligman Subdivision and Southern Transcon.

[1] As of 2018[update] about eight trains daily operate over the line with top speeds of up to 49 miles per hour (79 km/h).

The line from Williams to Ash fork was initially laid out by the Atlantic and Pacific Railroad, though much of this section was reconstructed by the Atchison, Topeka and Santa Fe Railway (predecessor to BNSF) in 1960 to bypass several sharp curves and steep gradients.

BNSF has purchased land from the State of Arizona and is in the process of planning and getting approval for a large intermodal/logistics center near Surprise.[when?