diff --git a/.changes/unreleased/Fixes-20230322-150627.yaml b/.changes/unreleased/Fixes-20230322-150627.yaml
new file mode 100644
index 000000000..90ef354f9
--- /dev/null
+++ b/.changes/unreleased/Fixes-20230322-150627.yaml
@@ -0,0 +1,6 @@
+kind: Fixes
+body: Enable single-line `private_key` for BigQuery Service Account JSON Authentication
+time: 2023-03-22T15:06:27.761416-06:00
+custom:
+  Author: dbeatty10
+  Issue: "7164"
diff --git a/dbt/adapters/bigquery/connections.py b/dbt/adapters/bigquery/connections.py
index 109e63c64..06da1ff90 100644
--- a/dbt/adapters/bigquery/connections.py
+++ b/dbt/adapters/bigquery/connections.py
@@ -158,6 +158,12 @@ class BigQueryCredentials(Credentials):
         "timeout_seconds": "job_execution_timeout_seconds",
     }
 
+    def __post_init__(self):
+        if self.keyfile_json and "private_key" in self.keyfile_json:
+            self.keyfile_json["private_key"] = self.keyfile_json["private_key"].replace(
+                "\\n", "\n"
+            )
+
     @property
     def type(self):
         return "bigquery"