Quebec Route 172

{{Short description|Highway in Quebec}}

{{Infobox road

|province=QC

|type=QC

|route=172

|maint=Transports Québec

|map=Route 172-QC.png

|established=

|decommissioned=

| length_km = 169.1

| length_round = 1

|length_ref=Ministère des transports, "Distances routières", page 75, Les Publications du Québec, 2005

|direction_a=West

|direction_b=East

|terminus_a= {{jct|state=QC|QC|169}} in Saint-Nazaire

|terminus_b= {{jct|state=QC|QC|138}} in Tadoussac

|previous_type=QC

|previous_route=171

|next_type=QC

|next_route=173

|cities=Saguenay

|junction= {{jct|state=QC|QC|175}} in Saguenay

}}

Route 172 is an east–west highway on the north shore of the St. Lawrence River in Quebec, Canada, and it parallels the Saguenay River on the north side of it. The western terminus of Route 172 is in Saint-Nazaire at the junction of Route 169, and the eastern terminus is in Tadoussac, at the junction of Route 138.