Ibrahim Al-Masyhur ibni Almarhum Sultan Abu Bakar Al-Khalil Ibrahim Shah (Jawi: سلطان سر إبراهيم المشهور ابن المرحوم سلطان أبو بكر الخليل إبراهيم شاه; 17 September 1873 – 8 May 1959) was a Malaysian sultan and the 2nd modern sultan of Johor. He was considered "fabulously wealthy."

An Anglophile, Ibrahim maintained close ties with the British crown and frequently leveraged his personal relationships with reigning monarchs to advocate for Johor's autonomy and resist the expansionist ambitions of the British Colonial Office. However, he became highly unpopular later in his native land for his opposition to Malayan independence. This led him to spend most of his time away from Johor, traveling extensively in Europe, particularly to Britain.

Wan Ibrahim was born 17 September 1873 in the Istana Bidadari, Singapore, and received his education at a boarding school in England during his formative years. He was appointed a second lieutenant of the Johor Military Forces (JMF) during his teenage years and was formally installed as the first Tunku Mahkota of Johor on 23 May 1891 and was brought to Europe by his father where he was introduced to the European royal families. During his term as the Tunku Mahkota, Tunku Ibrahim occasionally acted as the state's regent and was delegated a few state duties whenever the Sultan was travelling overseas. In his free time, Tunku Ibrahim spent most of his time in hunting and horseracing.

Tunku Ibrahim acted as one of the three signatories when Sultan Abu Bakar promogulated the Johor State Constitution in April 1895. The following month, Tunku Ibrahim accompanied Abu Bakar to London, who had the intent of seeking further negotiations with the Colonial Office on state affairs. Abu Bakar was by then very ill when he reached England, and Tunku Ibrahim spent much of his time by his father's bedside before Abu Bakar died the following month.

Tunku Ibrahim was proclaimed as the Sultan of Johor on the day of Abu Bakar's burial on 7 September 1895, while his one-year-old son, Tunku Ismail was proclaimed as his heir-apparent. A formal coronation ceremony took place on 2 November 1895. He took over the state government the following year, and one of his first reports was the financial difficulties which the state was facing. Many of his employees complained of delays in receiving their salaries; which were often paid in instalments. Sultan Ibrahim then took charge of closely supervising the state treasury, and personally witnessed the payment of the state's employees during payment day. In the same year, he also took on the task of appointing the committee members of the Johor Gambier and Pepper Society (also known as Kongkek in Malay). Sultan Ibrahim was inexperienced in public administration skills and heavily relied on his private secretary, Dato Amar DiRaja Abdul Rahman bin Andak on advice and assistance in running the affairs of the state.

The Resident General of the Federated Malay States, Frank Swettenham proposed to Sultan Ibrahim in November 1899 the construction of a railway line into Johor, in conjunction with his plan for the North-South Main Trunk Railway down the Malay Peninsula. Sultan Ibrahim welcomed Swettenham's plan but was weary of British influence in Johor and insisted on financing the construction of the railway line himself. Swettenham was comfortable with Sultan Ibrahim's prospect of financing the railway line using the state's revenue, and submitted his proposals to the Colonial Office in England. The proposals drew scepticism from the Secretary of State for the Colonies, Joseph Chamberlain, who was aware of Johor's financial difficulties and withheld decision. Sultan Ibrahim then sent his adviser Abdul Rahman Andak the following May to London to negotiate with the Colonial Office, and in April 1901, Sultan Ibrahim made a year-long trip to London to seek private English financiers to fund the construction of the railway line and negotiated with the Colonial Office for a railway loan. He managed to obtain a loan for the construction of the railway and the Johor Railway Convention was signed in July 1904 by his adviser, Abdul Rahman Andak, that gave provisions for an extension of the Malayan railway line to be extended into Johor.

Sultan Ibrahim returned to Johor the following year, and expanded the state's military forces, JMF. He instituted the Johor Volunteer Forces, which consisted of young Malay boys and served as the state's reservist soldiers. In 1906, he granted land concessions to English capitalists and financiers for development purposes. This drew the concern of the Straits Governor, Sir John Anderson, who was not very favourable with Sultan Ibrahim's intents to detach Johor's economic dependence from Singapore. He successfully pressured Sultan Ibrahim to dispense with the services of Abdul Rahman Andak as well as ceding the administrative powers of the railway line to the colonial government the following year after reports of the state's troubled finances were revealed.

Sultan Ibrahim was also facing political challenges from the British colonial government, who were ostensibly unhappy about his negligence in his state affairs and were seeking to extend greater political influence into the state. The Colonial Secretary of the Straits Settlements, Victor Bruce, Lord Elgin had met Sultan Ibrahim in 1906 and advised him to administer the state in favour of British interests and to cut down on his overseas travels to Europe. Sultan Ibrahim was adamant about Elgin's advice and was indignant to accept British advice, and was warned two years later by Lord Elgin on the possibility of the British enacting constitutional changes to the state administration. In 1910, Sultan Ibrahim accepted a British adviser for Johor after immense pressure from the colonial government. The British were extremely unhappy with the condition of Johor's finances, which was depleted as a result of Sultan Ibrahim's extensive overseas travels. The British-Resident of Negeri Sembilan, Douglas Graham Campbell was appointed as the first adviser of Johor.