The Fabulet River is a tributary of the Iroquois River (Nottaway River) in the administrative region of Nord-du-Québec, in the Canadian province of Quebec, in Canada.

This hydrographic slope does not have forest access roads. The surface of the river is usually frozen from early November to mid-May. However, safe ice circulation is generally from mid-November to mid-April.

The main neighboring hydrographic slopes are:

• North side: Richerville River, Nottaway River;
• East side: Richerville River, Nottaway River;
• South side: Kitchigama River, Iroquois River (Nottaway River);
• West side: Kitchigama River, Iroquois River (Nottaway River).

The Fabulet River originates from an unidentified lake (length: 1.2 kilometres (0.75 mi); altitude: 218 metres (715 ft)) located at:

• 6.5 kilometres (4.0 mi) Southwest of the Nottaway River;
• 18.7 kilometres (11.6 mi) Southeast of the mouth of the Fabulet River;
• 27.3 kilometres (17.0 mi) Southeast of the mouth of the Iroquois River (Nottaway River);
• 78.3 kilometres (48.7 mi) South of the mouth of the Nottaway River;
• 120 kilometres (75 mi) South of downtown Matagami

From its source in the Township of Desmazures, the Fabulet River flows over 26.9 kilometres (16.7 mi) according to the following segments:

• 1.7 kilometres (1.1 mi) southerly and westward across an unidentified lake (elevation: 214 metres (702 ft) to its mouth;
• 10.3 kilometres (6.4 mi) northwesterly to the South shore of Fabulet Lake;
• 2.2 kilometres (1.4 mi) northwesterly across Lake Fabulet (elevation: 176 metres (577 ft)) on its full length;
• 5.2 kilometres (3.2 mi) northwesterly, then southwesterly, to a stream (from the Southeast);
• 7.5 kilometres (4.7 mi) northwesterly by collecting several streams to its mouth.

The Fabulet River flows into a river bend on the eastern shore of the Iroquois River (Nottaway River). This confluence is located at:

• 8.8 kilometres (5.5 mi) Southeast of the mouth of the Iroquois River (Nottaway River);
• 60.2 kilometres (37.4 mi) Southeast of the mouth of the Nottaway River (confluence with Rupert Bay);
• 135 kilometres (84 mi) Northwest of downtown Matagami;
• 6.0 kilometres (3.7 mi) South of the Nottaway River.

The term "Fabulet" is a family name of French origin.

The toponym "Fabulet River" was formalized on December 5, 1968, at the Commission de toponymie du Québec, i.e. at the creation of this commission

• James Bay
• Rupert Bay
• Nottaway River
• Iroquois River (Nottaway River)
• List of rivers of Quebec