The International Congress of Orientalists, initiated in Paris in 1873, was an international conference of Orientalists. It was later renamed as the International Congress of Human Sciences in Asia and North Africa and then as the International Congress of Asian and North African Studies. This material covers the interaction of the Royal Asiatic Society with the Congress in the time period 1889 to 1993.

The Gibb Memorial Trust was established in 1902 in memory of Elias John Wilkinson Gibb, a largely self-taught Arabic, Persian, and, above all, of Ottoman Turkish, died age 45 in 1901 and his mother established the Trust. These papers mainly cover the period 1927-1951 and consists of governance, finance and publication documents, produced mainly as a result of Charles Ambrose Storey's involvement as a Trustee of the Trust.

The 22nd International Congress of Orientalists was held in Istanbul in September 1951. The material associated with this Congress is:

• Letter from Professor A.J. Arberry, Chairman of the Executive Committee, Association of British Orientalists, to Societies and Institutions to seek their opinion on the proposal to constitute an International Federation of Orientalist Societies which is to be included in the Agenda of the forthcoming 22nd Congress. Opinions gathered will be used to affect any decision taken by the Association of British Orientalists regarding the project. Typed, dated 5 May 1951.

Correspondence concerning the Second Turkish Linguistic Congress held in Istanbul on 18th August 1934. These are:

• Letter from The Counsellor, Turkish Embassy, London, to the Royal Asiatic Society, to inform them of the enclosed communication received from the Secretary of the Society for the Investigation of the Turkish language. Typed, dated 26 July 1934. With this letter is the notification of the Second Linguistic Congress to be held in Istanbul under the aegis of the Gazi Mustafa Kemal, Founder and Protector of the Society for the Investigation of the Turkish Language, typed document.
• Letter from Col, Hoysted, Secretary, Royal Asiatic Society, to The Counsellor, Turkish Embassy, to thank for his letter, and to note that though the matters are of great interest to the Society, the deadline for applying for participation is already passed. Typed, dated 30 July 1934.
• Letter from Col Hoysted, Secretary, Royal Asiatic Society, to Professor Margoliouth to state that he will send the information regarding the Congress to Mr Clauson, Sir Oliver Wardrop, Mr Guest and Mr Ellis. There is a further note to state that Margoliouth replied that he had no further remarks to make. Handwritten, dated 30 July 1934.
• Letter from The Counsellor, Turkish Embassy, London, to the Secretary, Royal Asiatic Society to inform him that it would still be possible for Members to participate if they could inform him at the earliest possible convenience. Typed, dated 31 July 1934.
• Letter from Col Hoysted, Secretary, Royal Asiatic Society, to Sir Oliver Wardrop to send the information regarding the Congress and ask him to send it on to Mr Clauson, Mr Ellis and Mr Guest. The letter has notes to state that it has been forwarded. Handwritten, dated 3 August 1934.
• Letter from R. Guest to Mr Ellis to forward the information as requested and to express his regret at not seeing Ellis at the British Museum. Typed, dated 6 August 1934.
• Letter from Dr Joseph de Somogyi to Col. Hoysted, Secretary, Royal Asiatic Society, to thank him for sending the communication concerning the Second Turkish Linguistic Congress and to return it for the Society's Papers. Handwritten, dated 23 October 1934.