Little Rattling Brook is a tributary of the Lower Exploits River system in central Newfoundland, flowing into the main stem below Grand Falls. As part of the greater Exploits River watershed — one of Newfoundland's most significant Atlantic salmon river systems — Little Rattling Brook carries the wild character typical of Newfoundland's interior brooks: cold, clear water running through boreal forest terrain before joining the lower Exploits. The brook sits within Salmon Fishing Area 5 (SFA 5) and is managed under the Exploits River Watershed Management Plan, placing it among a group of productive lower Exploits tributaries that include Great Rattling Brook, Stoney Brook, Three Brooks, and Greenwoods Brook.