Meridian barat ke-66

Meridian barat 66° dari Greenwich adalah garis bujur yang membentang dari Kutub Utara melintasi Samudra Arktik, Greenland, Amerika Utara, Samudra Atlantik, Laut Karibia, Amerika Selatan, Samudra Selatan, dan Antarktika hingga Kutub Selatan.

Meridian barat ke-66 membentuk lingkaran besar bersama meridian timur ke-114.

 Dari ujung ke ujung 
Berawal di Kutub Utara menuju selatan di Kutub Selatan, meridian barat ke-66 melintasi:

{| class="wikitable plainrowheaders"
! scope="col" width="120" | Koordinat
! scope="col" | Negara, teritori, atau laut
! scope="col" | Catatan
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Arktik
| style="background:#b0e0e6;" |
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Laut Lincoln
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Pulau Ellesmere
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Selat Nares
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
|
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Selat Nares
| style="background:#b0e0e6;" | Cekungan Kane
|-
| 
! scope="row" | 
|
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Baffin
| style="background:#b0e0e6;" |
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Selat Davis
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Semenanjung Cumberland, Pulau Baffin
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Selat Davis
| style="background:#b0e0e6;" | Teluk Cumberland
|-
| 
! scope="row" | 
| Nunavut — Semenanjung Hall, Pulau Baffin
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Frobisher
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Semenanjung Meta Incognita, Pulau Baffin
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Selat Hudson
| style="background:#b0e0e6;" |
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Ungava
| style="background:#b0e0e6;" |
|-valign="top"
| 
! scope="row" | 
| Quebec Newfoundland dan Labrador — Labrador, dari  Quebec — dari 
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Saint Lawrence
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Quebec — Semenanjung Gaspé
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Chaleur
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| New Brunswick
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Fundy
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nova Scotia
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Atlantik
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
|
|-valign="top"
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Laut Karibia
| style="background:#b0e0e6;" | Sebelah timur pulau La Orchila,  (di )
|-
| 
! scope="row" | 
|
|-valign="top"
| 
! scope="row" | 
| Amazonas Rondônia — dari 
|-
| 
! scope="row" | 
|
|-
| 
! scope="row" | 
|
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Atlantik
| style="background:#b0e0e6;" | Teluk San Jorge
|-
| 
! scope="row" | 
|
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Atlantik
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Isla Grande de Tierra del Fuego
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Atlantik
| style="background:#b0e0e6;" |
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Selatan
| style="background:#b0e0e6;" |
|-valign="top"
| 
! scope="row" | Antarktika
| Pulau Renaud — Teritori diklaim oleh ,  dan 
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Selatan
| style="background:#b0e0e6;" |
|-valign="top"
| 
! scope="row" | Antarktika
| Teritori diklaim oleh ,  dan 
|-
|}

 Lihat pula 
 Meridian barat ke-65
 Meridian barat ke-67

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