Route 70 is a 20.78-mile-long (33.44 km) north–south state highway in Worcester County, Massachusetts.

It passes several shopping plazas before turning more northward onto Boylston Street.

Route 70 passes through the far northwestern corner of Shrewsbury before entering the town of Boylston.

As it enters the town of Clinton, Route 70 begins a concurrency with Route 62 which lasts for approximately 2.6 miles (4.2 km), with the last 0.3 miles (0.48 km) being a triple concurrency with Route 110 through the center of town.

Once the route leaves the concurrency, it heads northward into the town of Lancaster.