State Route 17 (SR 17) is part of Maine's system of numbered state highways, running from US Route 1 (US 1) and US 1A in Rockland, through Augusta, to SR 4 in Rangeley. The route travels through the counties of Knox, Lincoln, Kennebec, Androscoggin, Franklin and Oxford.

SR 17 begins at US Routes 1 and 1A in Rockland. It heads northwest into the town of Rockport and intersects SR 90. It curves to the west into the town of Union. From here it has a 2.78-mile-long (4.47 km) concurrency with SR 235. It soon intersects SR 220 and crosses through Lincoln County into Kennebec County. Very soon, it heads into Augusta. It crosses the Kennebec River with US 201 and US 202. US 201 leaves once the routes cross the river, but US 202 stays with SR 17. Still in Augusta, the routes cross Interstate 95 (I-95) with an interchange. In Manchester, SR 17 leaves US 202. Soon, SR 17 enters Readfield and has a 2.37-mile-long (3.81 km) concurrency with SR 41. It enters the town of Livermore Falls and has a concurrency with SR 133. SR 133 ends at SR 4 and SR 17 turns northward with SR 4. It next has a concurrency with US 2. The concurrency is 16.79 miles (27.02 km) long and is located in the towns of Dixfield and Mexico. SR 17 then stays close to but never runs concurrent with SR 120. It does that from US 2 in Mexico to Roxbury. From the connector to SR 120 through Weld and to South Shore Drive in Rangeley, SR 17 intersects no major town roads. After South Shore Drive, SR 17 is by the coast of Rangeley Lake. Soon, it has its northern terminus at SR 4.