State Route 126 (SR 126) is a state highway in central Maine connecting Lewiston and Washington.

In Sabattus, it begins a long concurrency with SR 9, which continues until it reaches Gardiner.

From Gardiner, it travels eastward towards Washington.

[2] SR 126 was originally designated in 1925 and ran between Lewiston and Richmond Corner.

Shortly thereafter, it was extended to its current terminus near Washington.