Long Aar (also known as Long Ar) is a settlement in the mountainous interior of Sarawak, Malaysia. It lies approximately 595.4 kilometres (370 mi) east-north-east of the state capital Kuching.

Neighbouring settlements include:

• Pa Tik 6.7 kilometres (4.2 mi) northeast
• Kubaan 11.7 kilometres (7.3 mi) north
• Long Labid 13.5 kilometres (8.4 mi) south
• Long Semirang 18.3 kilometres (11.4 mi) northeast
• Aro Kangan 21.4 kilometres (13.3 mi) south
• Bario 22.4 kilometres (13.9 mi) northeast