- Ka'ba - The most holy structure in Islam situated in Mecca. Centre of the world according to Islam.
- Kabylia - Mountain area in northeastern Algeria, equalling a stretch of about 200 km.
- Kairouan - City in Tunisia with 150,000 inhabitants, situated inland in the northern part of Tunisia.
- Karaj - City in Iran with 940,000 inhabitants, in the Teheran Province.
- Karbala - City in Iraq with 550,000 inhabitants, situated about 50 km southeast of Baghdad.
- Karun - River of Iran, with its source in the Zagros Mountains.
- Kasbah - Traditional fortress and palace of towns in pre-colonial North Africa.
- Kemal, Mustafa - Founder of the modern republic of Turkey.
- Kenitra - City in Morocco with 580,000 inhabitants, situated in the northwestern part of the country.
- Kermanshah - City in Iran with 690,000 inhabitants.
- Khaled - Algerian musician and singer.
- Khalil, Al - City in Palestine with about 110,000 inhabitants.
- Kharijis - The smallest of the three orientations in Islam, today counting for less than 1% of all Muslims.
- Khartoum - Capital of Sudan with 1,2 million inhabitants.
- Khayyam, Omar - Persian mathematician and poet.
- Khomeini, Ayatullah - Iranian religious leader and politician.
- Khufu - Egyptian Pharaoh reigning in the 26th century BCE, being the 2nd ruler in the 4th dynasty.
- Khutba - A central sermon in Islam, performed with the midday prayer in the mosque on Friday.
- Kiddush - Jewish praise used in the home, and in the synagogues, as a start of the sabbath and of holidays.
- Kippah - Skullcap worn by Jews during prayer.
- Knesset - From Hebrew, meaning 'assembly'. The parliament of Israel, located to Jerusalem.
- Konya - City in central Turkey with 600,000 inhabitants.
- Koran - The holy book of Islam. Also referred to in English as "Quran", or "Qur'an".
- Kosher - Jewish rules for what is ritually acceptable.
- Kufra - Group of oases in southeastern Libya, with a population of about 10,000.
- Kurds - People living in a landscape called Kurdistan.
- Kuwait - Independent monarchy, divided into 5 governorates, bordering southeastern Iraq northeastern Saudi Arabia.
- Kuwait City - Capital of Kuwait with 900,000 inhabitants.
