Miramichi River Valley is an incorporated rural community in the Canadian province of New Brunswick. It was formed through the 2023 New Brunswick local governance reforms.

Miramichi River Valley was incorporated on January 1, 2023.

Miramichi River Valley residents are able to cast votes in the rural community's elections. The community is within the federal electoral district of Miramichi-Grand Lake, and within the provincial electoral district of Southwest Miramichi-Bay du Vin.

The mayors of Blackville during its time as an incorporated village from 1967 to 2022 included:

1. Lawrence Stephens (1967-1969)
2. Harold Connors (1969-1971)
3. Roland Walls (1971-1992)
4. Glen Hollowood (1992-1998)
5. Roland Walls (1998-2001)
6. Omer MacKenzie (2001-2004)
7. Glen Hollowood (2004-2012)
8. Harold Muck (2012-2013)
9. Matthew Sturgeon (2013)
10. Andrew Hawkes (2013-2016)
11. Christopher Hennessy (2016-2021)
12. Ian Fortune (2021-2022)

Miramichi River Valley's economy was once tied to the forest industry. A large sawmill that employed 200 workers had been operated in the village by industrial conglomerate UPM Kymmene, but it closed in 2007 as a result of economic pressures.

Miramichi River Valley is home to a single financial institution, Blackville Credit Union. It is the oldest of its kind in New Brunswick.

Blackville School, grades K - 12, is a public school in the community. This is the only grade school in Miramichi River Valley, with students occasionally transporting to other Miramichi schools instead (Such as Miramichi Valley High School).

• Herb Curtis
• J. F. A. McManus
• Kathy McCormack
• Marion Leane Smith (Lived her final years and died in Blackville.)

• List of communities in New Brunswick
• List of municipalities in New Brunswick