Panjang may refer to:
- Lang Island, a.k.a. Panjang Island, in the Sunda Strait between Java and Sumatra
- Panjang Island in the South Natuna Islands off western Borneo (02°45′N 108°55′E / 2.750°N 108.917°E / 2.750; 108.917)
- Panjang Island in the middle group of the Natuna Islands off western Borneo (04°15′N 108°12′E / 4.250°N 108.200°E / 4.250; 108.200)
- Panjang Island at the mouth of the Kapuas River in West Kalimantan, Borneo (00°02′N 109°13′E / 0.033°N 109.217°E / 0.033; 109.217)
- Panjang Island off the coast of Sumbawa