Bos is a river of Saarland, Germany. It is a left tributary of the Nahe, which it joins in Gonnesweiler.

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The Bos originates at the Zallenberg at an elevation of 490 metres (1,610 ft) above sea level. From here, the stream flows predominantly to the east. It passes the village of Bosen, part of Nohfelden, on the north and then, after about 3.4 kilometres (2.1 mi), it reaches the Bostalsee. Just before the reservoir it is joined by the right tributary Pärwiesbach which reaches it after flowing through Bosen. Its mouth is located about 300 metres (980 ft) south of the village of Eckelhausen, also part of Nohfelden. The outlet of the Bostalsee is located southwest of Gonnesweiler. South of the Bostalsee the Dämelbach flows into the Bos. After only about a further 1 kilometre (3,300 ft) the Bos joins the Nahe on the left at an elevation of 379 metres (1,243 ft) above sea level.

On its 5.8-kilometre-long (3.6 mi) course, the Bos drops 111 metres (364 ft), which corresponds to a mean bottom slope of 1.91%. It drains a 12,634 square kilometres (4,878 sq mi) drainage basin.

• Jordanbach (right)
• Dumpfbach (right)
• Seifenbach (left)
• Letschbruchbach (left)
• Steinfloß (left)
• Parwiesbach (right)
• Altertbach (left)
• Sandbach (left)
• Trieschwiesbach (right)
• Dämelbach (right)
• Krämersbach (right)

• List of rivers of Saarland