| Official Name: | Spencer Brook |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Minnesota#USA |
| Pushpin Label: | Spencer Brook |
| Pushpin Label Position: | left |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Minnesota |
| Subdivision Type2: | County |
| Subdivision Name2: | Isanti |
| Subdivision Type3: | Township |
| Subdivision Name3: | Spencer Brook Township |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 951 |
| Coordinates: | 45.5219°N -93.4406°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 55371 |
| Area Code: | 763 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 654954 |
Spencer Brook is an unincorporated community in Spencer Brook Township, Isanti County, Minnesota, United States.
Isanti County Roads 7 and 40 are two of the main routes in the community. Spencer Brook is located between Bradford and Princeton. The Rum River and Spencer Brook both flow through the community.
Spencer Brook was one of the first communities in Isanti County, settled in the late 1850s by Yankees from the east coast, many Civil War veterans. Spencer Brook includes the historic country school and Able Hearts Community and Christian Counseling formerly Spencer Brook United Methodist Church. It was named after Benjamin Nicholson Spencer (1806-1881) who came from Turkeyfoot, PA and came to Minnesota in 1854 and was Alderman of the 1st Ward of Spencer Brook Township. Benjamin was a Judge, carpenter, and farmer.
The Princeton Union March 31, 1881 page 1.