This is a list of lakes of Ontario beginning with the letter A.
A–Ab
A Lake
Aaron Lake (Timiskaming District) Aaron Lake (Kenora District) Abamasagi Lake Abamategwia Lake Abams Lake Abate Lake Abazotikichuan Lake Abbe Lake Abbess Lake Abbey Lake Abbie Lake Abbotsford Lake Abbott Lake (Sudbury District) Abbott Lake (Kenora District) Abbott Lake (Frontenac County) Abbott Lake (Rainy River District) Abelson Lake Aber Lake Abernethy Lake Abes Lake Abie Lake Abigogami Lake Abimatinu Lake Abinette Lake Lake Abitibi Abney Lake Abram Lake (Kenora District) Abram Lake (Cochrane District) Abs Lake
Ac
Acanthus Lake
Ace Lake (Thunder Bay District) Ace Lake (Sudbury District) Acer Lake Achapi Lake Acheson Lake (Rainy River District) Acheson Lake (Sudbury District) Achigan Lake Acid Lake Acker Lake Ackerman Lake Acme Lake (Algoma District) Acme Lake (Nipissing District) Acolyte Lake Aconda Lake Acorn Lake Acre Lake Acton Lake Acton Pond
Ad
Ada Lake (Muskoka District) Ada Lake (Sudbury District) Ada Lake (Thunder Bay District) Adagio Lake Adair Lake (Kenora District) Adair Lake (Adrian Township, Thunder Bay District) Adair Lake (Sound Creek, Thunder Bay District) Adam Lake Adamac Lake Adamhay Lake Adams Lake (Muskoka District) Adams Lake (Lanark County) Adams Lake (Renfrew County) Adams Lake (Sudbury District) Adams Lake (Haliburton County) Adamson Lake (Timiskaming District) Adamson Lake (Kenora District) Adanac Lake Add Lake Addie Lake Addington Lake Addison Lake (Thunder Bay District) Addison Lake (Sudbury District) Adel Lake Adelaide Lake (Sudbury District) Adelaide Lake (Algoma District) Adelard Lake Adele Lake Adik Lake Adios Lake Admiral Lake Admit Lake Adobe Lake Adrian Lake Adrienne Lake Adventure Lake Adze Lake
Ae–Af
Aegean Lake
Aerial Lake (Kenora District) Aerial Lake (Thunder Bay District) Aerobus Lake Aerofoil Lake Aeroplane Lake Affleck Lake (Kenora District) Affleck Lake (Sudbury District) A-frame Lake
Ag
Agam Lake
Agar Lake
Agassiz Lake
Agate Lake (Peterborough County) Agate Lake (Thunder Bay District) Agate Lake (Cochrane District) Agawa Lake Agawa Station Lake Agimak Lake Agnes Lake (Rainy River District) Agnes Lake (Parry Sound District) Agnew Lake (Sudbury District) Agnew Lake (Kenora District) Agonzon Lake Agreen Lake Aguasabon Lake Ague Lake Agusada Lake Agusk Lake Agutua Lake
Ah–Ai
Ahdik Lake
Ahern Lake
Ahmabel Lake
Ahme Lake
Ahmic Lake
Ahsine Lake
Aiabewatik Lake
Aide Lake
Aikens Lake
Aikman Lake
Aileen Lake
Ainslie Lake
Air Hole Lake
Aird Lake
Airplane Lake (Sudbury District) Airplane Lake (Algoma District) Airport Lake (Algoma District) Airport Lake (Thunder Bay District) Airstrip Lake Airy Lake Aitken Lake (Algoma District) Aitken Lake (Cochrane District)