Vlahina ({{Lang-bg|Влахина}}) or Vlaina ({{Lang-mk|Влаина}}), meaning "Vlach [mountain]" is a mountain range on the border of southwestern Bulgaria and eastern North Macedonia. The highest peak is Ogreyak (also known as Kadiytsa) at 1,924 m. Nearby towns include Simitli to the northeast in Bulgaria and Pehchevo to the southwest in North Macedonia.

• John Blennerhassett (1691–1775)
• John Blennerhassett (1715–1763)
• John Blennerhassett (1769–1794)
• John Blennerhassett (died 1677)
• John Blennerhassett (died 1709)
• John Blennerhassett (disambiguation)
• John Blennerhassett (judge)
• John Blennerhassett (landowner)
• John Blennerhassett Martin
• John Blennerhassett (MP)
• John Bligh, 1st Earl of Darnley
• John Bligh (medical educator)
• John Bligh (Royal Navy officer)
• John Bligh Suttor
• John B. Lindale House
• John Blinkhorn
• John B. Lipscomb
• John Blissard
• John Blocki
• John Block (South African politician)
• John Block (South African Politician)
• John Blofeld (judge)
• John Blois
• John Bloomfield (academic)
• John Bloomfield (Australian academic)