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Binjai (English: or, ), formally Kota Binjai (Binjai City), is an independent city in the North Sumatra province of Indonesia, bordered by Deli Serdang Regency to the east and Langkat Regency to the west. Binjai is connected to Medan (the provincial capital), about 22 km to the east, by the Sumatra highway that goes to Banda Aceh, and effectively forms a part of Greater Medan. The city's population was 181,904 in the 1990 Census, 224,516 in the 2000 Census, 246,154 in the 2010 Census, and 291,842 in the 2020 Census; the official estimate as of mid 2025 was 310,932 (comprising 155,462 males and 155,470 females). In mid 2025, 50,654 inhabitants lived in the Binjai District of Langkat Regency, outside the city limits but immediately north of the city.

The origin of Binjai when it established itself as a city is unknown. Historically, the Binjai area was situated between two Malay kingdoms, Deli and Langkat. Binjai grew from a small village on the edge of the Bingai River.

According to oral and written accounts of the area's history, the city of Binjai grew from a small village on the edge of the Bingai River, approximately where the Pekan Binjai village is today. Traditional ceremonies were held to lay the foundations of the small village in the shade of a large binjai tree at the edge of the Bingai River, which flows into the Wampu River, which is navigable for a large portion of its length.

Around the tree were built several houses, which were gradually enlarged, until finally a village hall was built. A lively port also developed, visited by barges from Stabat, Tanjung Pura, and the Strait of Malacca. Over time, the Binjai tree gave its name to the growing city.

Binjai is located between the Mencirim, Bangkatan, and Bingai rivers. On average, it is 28m above sea level. As the crow flies, Binjai is only 8 km from Medan, although Kabupaten Deli Serdang separates the two. However, the route of the Sumatara Highway increases the effective distance between the two cities to 22 km.

The two nearby rivers, the Bingai and Mencirim Rivers satisfy the needs of the city for clean water, which is distributed by the local water company. However, many people rely on wells for their water supply.

Binjai has a tropical rainforest climate (Af) with heavy rainfall year-round.