Bolia may refer to:

• an ethnic subgroup of the Mongo people
• a Bantu language, see Guthrie classification of Bantu languages
• Bolia (town) in Inongo Territory of Mai-Ndombe Province of the Democratic Republic of the Congo
• the Bolia River in the Democratic Republic of the Congo, tributary of the Bolombo River
• Bolia Sector, a fourth-level subdivision in Inongo Territory, Mai-Ndombe Province, Democratic Republic of the Congo
• the Battle of Bolia a battle in 469 CE in eastern Europe
• the Bolia River in eastern Europe now known as the Ipeľ

• 6.5x54 Mannlicher-Schönauer
• 6.5x55
• 6.5 x 55
• 6.5 x 55 Mauser
• 6.5x55 mm
• 6.5 x 55 mm
• 6.5x55 Swedish
• 6.5 x 63 Messner Magnum
• 6.5 x 68
• 6.5 X 68
• 6.5 X 68 RWS
• 65XE
• 6.5×25mm CBJ
• 6.5×47mm Lapua
• 6.5×50mmSR Arisaka
• 6.5×52mm Carcano
• 6.5×68mm
• +66
• 66
• 6600 BC
• 6/6/00 - Cardiff Wales
• 6/6/00 – Cardiff, Wales
• 660 BCE
• 660 Crescentia
• 660 in poetry