The Straits of Johor (also known as the Tebrau Strait, Johor Strait, Selat Johor, Selat Tebrau, and Tebrau Reach) is a strait that separates the Malaysian state of Johor to the north from Singapore to the south.

The Straits of Johor is the location of two Victoria Cross deeds. The award was for Lieutenant Ian Edward Fraser and Acting Leading Seaman James Joseph Magennis for the sinking of the 9,850-tonne Japanese cruiser Takao on 31 July 1945.

There are currently two man-made land connections over the straits. The Johor-Singapore Causeway, known simply as "The Causeway", links Johor Bahru and Woodlands in Singapore, while a bridge, known as the Malaysia-Singapore Second Link, further west of the straits links Gelang Patah in Johor and Tuas in Singapore.

In 2003, Malaysia wanted to build a bridge across the strait to replace the existing causeway, but negotiations with Singapore were not successful. The main reasons cited for the change were:

In August 2003, Malaysia announced that it was going ahead with a plan to build a gently sloping, curved bridge that would join up with Singapore's half of the existing causeway. The plans included a swing bridge for the railway line. However, plans to build the bridge have been called off as of 2006.

Johor 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 and royal city of Johor is Johor Bahru, formerly known as Tanjung Puteri (Malay for Princess's Cape). 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.

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 Arabic 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.