Lough Rinn (also spelled Lough Rynn) is a freshwater lake located near Mohill in County Leitrim, Ireland. The lake sits within the grounds of the Lough Rynn Castle Estate, a 17th-century property, and paddlers on the water have views of the castle, its walled gardens, and the surrounding estate. The setting offers a combination of natural and historic landscape visible directly from the water.

The lake is well established as a paddling destination and is used for both guided tours and structured programmes. Lough Rynn Kayaking Tours operates guided 90-minute paddle experiences on the lake, catering to all ability levels from beginners to more experienced paddlers, with groups of up to six persons accompanied by a guide. The Lough Rinn Sports Hub, in conjunction with Leitrim Sports Partnership, also runs multi-week kayaking programmes for adults, teenagers, and children aged 10 and over, as well as stand-up paddleboarding sessions. Equipment including kayaks, buoyancy aids, and helmets is provided through these programmes. Participants in the Sports Hub programmes are required to be able to swim, and sessions are weather-dependent and may be postponed due to unsafe conditions.

The lake is also noted for angling, and the surrounding amenity area includes a caravan and camping park with modern facilities including showers, a campers' kitchen, washing facilities, and electricity points. The campsite covers nearly eight hectares and accommodates up to 20 pitches, making it a practical base for paddlers planning an overnight stay. Horse riding and a children's playground are also available nearby, and the town of Carrick-on-Shannon is approximately 15 kilometres away.

The lake's character is calm and suitable for flatwater paddling. Wildlife, flora, and fauna are noted as features of interest along the shoreline. The area around the lake is described as tranquil countryside, and the combination of the castle estate backdrop and natural surroundings gives the paddling experience a distinctive character tied to the local heritage of County Leitrim.