Guajará-Mirim is a municipality in the Brazilian state of Rondônia. It is located at an altitude of 128 meters. Its population was 46,556 (2020) and its area is 24,856 km².^[2]

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Guajará-Mirim
Municipality
Flag Coat of arms
Location in Rondônia state
Guajará-Mirim Location in Brazil
Coordinates: 10°46′58″S 65°20′22″W
Country	Brazil
Region	North
State	Rondônia
Area
• Total	24,856 km2 (9,597 sq mi)
Population  (2020 [1])
• Total	46,556
• Density	1.9/km2 (4.9/sq mi)
Time zone	UTC−4 (AMT)

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Guajará-Mirim lies along the Mamoré River, just across the Bolivian border town of Guayaramerín. It was once the southern terminus of the Estrada de Ferro Madeira-Mamoré (the Madeira-Mamoré Railway), which was inaugurated in 1912. It is the seat of the Roman Catholic Diocese of Guajará-Mirim.

The municipality contains the 22,540 hectares (55,700 acres) Traçadal Biological Reserve, a strictly protected area that was created in 1990.^[3] It contains 2.33% of the 216,568 hectares (535,150 acres) Guajará-Mirim State Park, created in 1990.^[4] It contains the 46,438 hectares (114,750 acres) Rio Ouro Preto Biological Reserve, created in 1990.^[5] It contains 73.45% of the 204,632 hectares (505,660 acres) Rio Ouro Preto Extractive Reserve, also created in 1990.^[6] The municipality contains 47.5% of the 146,400 hectares (362,000 acres) Rio Cautário State Extractive Reserve, created in 1995.^[7] It contains the 73,818 hectares (182,410 acres) Rio Cautário Federal Extractive Reserve, created in 2001.^[8]