You capitalize Osama bin Laden’s name by writing: Osama bin Laden

  • Osama – capital “O”
  • bin – lowercase “b” when it appears between names (as in Osama bin Laden)
  • Laden – capital “L”

This is the standard editorial practice in English-language journalism and most style guides.

Why “bin” is lowercase

In Arabic patronymic constructions, bin (or ibn) means “son of.” In English transliteration:

  • When it’s part of a full name like Osama bin Laden , style guides treat it as a lowercase element:
    • Example: Osama bin Laden , Salah bin Abdulaziz.
  • When it appears at the start of a sentence or as a standalone reference, it’s capitalized:
    • Example: “Bin Laden was born in Riyadh.”

So the rule is:

  • Full name with first name : Osama bin Laden (lowercase bin)
  • Start of sentence or standalone : Bin Laden (capital B)

Variations in spelling

You may also see:

  • Usama bin Laden (closer to some Arabic pronunciations; used by the FBI and some government documents)
  • Usamah bin Laden (another transliteration variant)

Even with these variants, the capitalization pattern stays the same:

  • Usama bin Laden
  • Usamah bin Laden
  • Bin Laden (when used alone or at the start of a sentence)

Quick rules to remember

  1. Capitalize the first name: Osama , Usama , Usamah.
  2. Keep bin lowercase inside the full name: Osama bin Laden.
  3. Capitalize Bin when it stands alone or begins a sentence: Bin Laden , “Bin Laden was…”
  4. Capitalize Laden (or Ladin in some transliterations) as a proper noun.

This pattern matches how English style guides treat similar Arabic names: capital first name, lowercase bin/ibn in the middle, capital surname/family name.

Information gathered from public forums or data available on the internet and portrayed here.