The following is a list of rivers in Maine, by region:

Saint John River
Saint John River
Northwest Branch Saint John River
Daaquam River
Southwest Branch Saint John River
Little Southwest Branch Saint John River
Baker Branch Saint John River
Big Black River
Shields Branch
Little Saint Roch River
Little Black River
West Branch Little Black River
Campbell Branch Little Black River
Allagash River
St. Francis River
Fish River
Red River
Birch River
North Branch Birch River
South Branch Birch River
Little River
Aroostook River
St. Croix Stream
Blackwater River
North Branch Blackwater River
South Branch Blackwater River
Machias River
South Branch Machias River
Little Machias River
Little Madawaska River
River De Chute
Meduxnekeag River
South Branch Meduxnekeag River
North Branch Meduxnekeag River

Down East
St. Croix River
Little River
Little River
Pennamaquan River
Hardscrabble River
Dennys River
Orange River
Machias River
West Branch Machias River
Crooked River
Middle River
East Machias River
Maine River
Englishman River
Chandler River
East Branch Chandler River
Sandy River
Indian River
Southwest Branch Indian River
West River
Pleasant River
Western Little River
Little River
West Branch Pleasant River
Harrington River
Mill River
Narraguagus River
West Branch Narraguagus River (Hancock County, Maine)
Little Narraguagus River
West Branch Narraguagus River (Cherryfield, Maine)
Spring River
Skillings River
Jordan River
Union River
East Branch Union River
Bog River
Middle Branch Union River
West Branch Union River
Little Bog River
Benjamin River

Penobscot Bay
Bagaduce River
Penobscot River
East Branch Penobscot River
Seboeis River
Little Seboeis River
West Branch Penobscot River
North Branch Penobscot River
South Branch Penobscot River
Passadumkeag River
East Branch Passadumkeag River
West Branch Passadumkeag River
Mattawamkeag River
East Branch Mattawamkeag River
West Branch Mattawamkeag River
Molunkus River
Piscataquis River
East Branch Piscataquis River
West Branch Piscataquis River
Sebec River
Pleasant River
East Branch Pleasant River
Middle Branch Pleasant River
West Branch Pleasant River
Stillwater River
North Branch Marsh River
South Branch Marsh River
Orland River
Narramissic River
Dead River
Passagassawakeag River
Goose River
Little River
Ducktrap River
Megunticook River
Goose River

Mid Coast
Weskeag River
Saint George River
Dead River
Back River
Oyster River
West Branch Oyster River
East Branch Oyster River
Mill River
Meduncook River
Back River
Medomak River
Back River
Goose River
Pemaquid River
Johns River
Eastern Branch Johns River
North Branch Johns River
Damariscotta River
Little River
Sheepscot River
West Branch Sheepscot River
Marsh River
Little River

Kennebec River
Kennebec River
Moose River
South Branch Moose River
East Branch Moose River
West Branch Moose River
Roach River
Dead River (also called West Branch)
North Branch Dead River
South Branch Dead River
Carrabassett River
South Branch Carrabassett River
West Branch Carrabassett River
Sandy River
South Branch Sandy River
Sebasticook River
East Branch Sebasticook River
Little River
Eastern River
East Branch Eastern River
West Branch Eastern River
Abagadasset River
Androscoggin River
Rapid River
Cupsuptic River
East Branch Cupsuptic River
Little East Branch Cupsuptic River
Kennebago River
Rangeley River
Magalloway River
Second East Branch Magalloway River
West Branch Magalloway River
Third East Branch Magalloway River
First East Branch Magalloway River
Little Magalloway River
Middle Branch Little Magalloway River
West Branch Little Magalloway River
Dead Cambridge River
Swift Cambridge River
Wild River
Pleasant River
East Branch Pleasant River
West Branch Pleasant River
Alder River
Sunday River
South Branch Sunday River
Bear River
Ellis River
West Branch Ellis River
Concord River
Swift River
West Branch Swift River
East Branch Swift River
Webb River
Dead River
Nezinscot River
East Branch Nezinscot River
West Branch Nezinscot River
Sabattus River
Dead River
Little Androscoggin River
Sanborn River
Little River
Muddy River
Cathance River
Cross River
Back River

Southern Maine
Morse River
Sprague River
New Meadows River
Little River
Harraseeket River
Royal River
Cousins River
Presumpscot River
Tenny River
Songo River
Bear River
Crooked River
Muddy River
Northwest River
Sticky River
Pleasant River
Little River
North Branch Little River
Piscataqua River
East Branch Piscataqua River
Fore River
Stroudwater River
South Branch Stroudwater River
Spurwink River
Scarborough River
Dunstan River
Nonesuch River
Libby River
Saco River
Old Course Saco River
Charles River
Cold River
Mad River
Middle Branch Mad River
South Branch Mad River
Little Cold River
Kezar River
Little Saco River
Shepards River
Tenmile River
West Branch Tenmile River
Ossipee River
South River
Little River
Little Ossipee River
Little River
Batson River
Kennebunk River
Mousam River
Middle Branch Mousam River
Littlefield River
Little River
Merriland River
Webhannet River
Ogunquit River
Josias River
Cape Neddick River
Little River
York River
Piscataqua River
Salmon Falls River
Little River
Great Works River
Neoutaquet River

Maine