The term Unfederated Malay States was the collective name given to five British protected states in the Malay peninsula in the first half of the twentieth century. These states were Johor

Johor

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...

, Kedah

Kedah

Kedah is a state of Malaysia, located in the northwestern part of Peninsular Malaysia. The state covers a total area of over 9,000 km², and it consists of the mainland and Langkawi. The mainland has a relatively flat terrain, which is used to grow rice...

, Kelantan

Kelantan

Kelantan is a state of Malaysia. The capital and royal seat is Kota Bharu. The Arabic honorific of the state is Darul Naim, ....

, Perlis

Perlis

Perlis is the smallest state in Malaysia. It lies at the northern part of the west coast of Peninsular Malaysia and has Satun and Songkhla Provinces of Thailand on its northern border. It is bordered by the state of Kedah to the south...

, and Terengganu

Terengganu

Terengganu is a sultanate and constitutive state of federal Malaysia. The state is also known by its Arabic honorific, Darul Iman...

. In contrast with the four neighbouring Federated Malay States

Federated Malay States

The Federated Malay States was a federation of four protected states in the Malay Peninsula—Selangor, Perak, Negeri Sembilan and Pahang—established by the British government in 1895, which lasted until 1946, when they, together with the Straits Settlements and the Unfederated Malay...

 of Selangor

Selangor

Selangor also known by its Arabic honorific, Darul Ehsan, or "Abode of Sincerity") is one of the 13 states of Malaysia. It is on the west coast of Peninsular Malaysia and is bordered by Perak to the north, Pahang to the east, Negeri Sembilan to the south and the Strait of Malacca to the west...

, Perak

Perak

Perak , one of the 13 states of Malaysia, is the second largest state in the Peninsular Malaysia bordering Kedah and Yala Province of Thailand to the north, Penang to the northwest, Kelantan and Pahang to the east, Selangor the Strait of Malacca to the south and west.Perak means silver in Malay...

, Pahang

Pahang

Pahang is the third largest state in Malaysia, after Sarawak and Sabah, occupying the huge Pahang River river basin. It is bordered to the north by Kelantan, to the west by Perak, Selangor, Negeri Sembilan, to the south by Johor and to the east by Terengganu and the South China Sea.Its state...

, and Negri Sembilan, the five Unfederated Malay States lacked common institutions, and did not form a single state in international law.

In 1946 the British colony of the Straits Settlements

Straits Settlements

The Straits Settlements were a group of British territories located in Southeast Asia.Originally established in 1826 as part of the territories controlled by the British East India Company, the Straits Settlements came under direct British control as a crown colony on 1 April 1867...

 was dissolved.