Korea, South
noun: Korean(s)
adjective: Korean

Kosovo
noun: Kosovar (Albanian), Kosovac (Serbian)
adjective: Kosovar (Albanian), Kosovski (Serbian)
note: Kosovan, a neutral term, is sometimes also used as a noun or
adjective

Kuwait
noun: Kuwaiti(s)
adjective: Kuwaiti

Kyrgyzstan
noun: Kyrgyzstani(s)
adjective: Kyrgyzstani

Laos
noun: Lao(s) or Laotian(s)
adjective: Lao or Laotian

Latvia
noun: Latvian(s)
adjective: Latvian

Lebanon
noun: Lebanese (singular and plural)
adjective: Lebanese

Lesotho
noun: Mosotho (singular), Basotho (plural)
adjective: Basotho

Liberia
noun: Liberian(s)
adjective: Liberian

Libya
noun: Libyan(s)
adjective: Libyan