Meridian barat ke-78

Meridian barat 78° dari Greenwich adalah garis bujur yang membentang dari Kutub Utara melintasi Samudra Arktik, Amerika Utara, Samudra Atlantik, Laut Karibia, Amerika Selatan, Samudra Pasifik, dan Antarktika hingga Kutub Selatan.

Meridian barat ke-78 membentuk lingkaran besar bersama meridian timur ke-102.

Dari ujung ke ujung 
Berawal di Kutub Utara menuju selatan di Kutub Selatan, meridian barat ke-78 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;" |
|-
| 
! scope="row" | 
| Nunavut — Ellesmere
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Baffin
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Pulau Ellesmere
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Baffin
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Pulau Bylot
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Eclipse
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Pulau Baffin
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Foxe Basin
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Pulau Koch
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Foxe Basin
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Semenanjung Foxe, Pulau Baffin
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Selat Foxe
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — pulau tak bernama di sebelah barat Pulau Mill
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Selat Foxe
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Pulau Nottingham
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Selat Foxe
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Kepulauan Digges
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Hudson
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Quebec — Semenanjung Ungava
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Hudson
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Quebec — Semenanjung Ungava
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Hudson
| style="background:#b0e0e6;" |
|-valign="top"
| 
! scope="row" | 
| Quebec — Semenanjung Ungava Nunavut — dari , Pulau Frazier
|-valign="top"
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Teluk Hudson
| style="background:#b0e0e6;" | Passing through the Salikuit (di )
|-valign="top"
| 
! scope="row" | 
| Quebec Ontario — dari 
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Danau Ontario
| style="background:#b0e0e6;" |
|-valign="top"
| 
! scope="row" | 
| New York Pennsylvania — dari  Maryland — dari  West Virginia — dari  Virginia — dari  North Carolina — dari 
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Atlantik
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Pulau Bahama Besar
|-valign="top"
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Atlantik
| style="background:#b0e0e6;" | Sebelah barat Kepulauan Berry,  (di )
|-
| 
! scope="row" | 
| Pulau Andros
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Atlantik
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Cayo Romano dan daratan utama
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Laut Karibia
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
|
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Laut Karibia
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
|
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Pasifik
| style="background:#b0e0e6;" | Sebelah timur Pulau Gorgona,  (di )
|-
| 
! scope="row" | 
|
|-
| 
! scope="row" | 
|
|-
| 
! scope="row" | 
|
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Pasifik
| style="background:#b0e0e6;" |
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Samudra Selatan
| style="background:#b0e0e6;" |
|-valign="top"
| 
! scope="row" | Antarktika
| Diklaim oleh  (Antártica Chilena Province) dan  (Teritori Antarktika Britania)
|-
|}

Lihat pula 
 Meridian barat ke-77
 Meridian barat ke-79

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