Johor (/dʒəˈhɔər, ˌdʒoʊ-/) or Johore is a Malaysian state, located in the southern portion of Peninsular Malaysia. It is one of the most developed states in Malaysia. The state capital city of Johor is Johor Bahru. The royal city of the state is Muar and the old state capital is Johor Lama.

Johor is surrounded by Pahang to the north, Malacca and Negeri Sembilan to the northwest, and the Straits of Johor to the south, which separates Johor and the Republic of Singapore. The state also shares a maritime border with the Riau Archipelago from the east and Riau mainland on the west by the South China Sea and the Strait of Malacca respectively, both of Indonesian territories.

Johor is also known by its Arabic honorific, Darul Ta'zim, or "Abode of Dignity", and as Johore in English.

The name "Johor" originated from the Persian word Jauhar, 'gem/jewel'. Malays tend to name a place after natural objects in great abundance or having visual dominance. Before the name Johor was adopted, the area south of the Muar River to Singapore island was known as Ujong Tanah or 'land's end' in Malay, due to its location at the end of the Malay Peninsula. Coincidentally, Johor is the most southern point of the Asian continental mainland.

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