Johor 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.