List of rivers of Maine

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