Georg August Wallin (Finnish: Yrjö Aukusti Wallin), also known as Abd al-Wali (Arabic: عبد الولي; 24 October 1811 – 23 October 1852), was a Finland Swede orientalist, explorer and professor at the University of Helsinki, remembered for his journeys across the Arabian Peninsula in the 1840s. He was the first Western scholar to study spoken Arabic systematically, the first European to record Bedouin poetry and dialects in the field, and among the first Europeans to reach several locations in northern Arabia. Internationally he has been ranked among the most capable European explorers of Arabia, and was awarded the gold medal of the Royal Geographical Society in 1851.

Wallin was born in the municipality of Sund, Åland, in 1811, and his parents were civil servant Israel Wallin (1777–1839) and Johanna Maria Ahrenberg (1779–1854). He attended Cathedral School of Åbo in Turku and moved to Rauma with the school after the Great Fire of Turku in 1827. The following year, however, he left school and continued his studies privately.^{[citation needed]} In 1829, he enrolled to study Oriental languages at the University of Helsinki, graduating with an MA after seven years of studies. He then began writing a dissertation about Arabic and Persian, while working as a librarian in the university library.^{[citation needed]} In 1839, he travelled to St. Petersburg, where he studied at the Institute of Oriental Languages, under the Russian Ministry of Foreign Affairs, under the Egyptian sheikh Muhammad 'Ayyad al-Tantawi [Wikidata] in 1841–1842. Al-Tantawi, whose accounts of Egypt and the Arab world made a deep impression on Wallin, is considered to have had the single greatest influence on Wallin and his decision to travel to the Middle East.

Wallin's motives for travelling to Arabia were of two kinds. In his application for a research grant he emphasised the scholarly neglect of Arabic dialects, which his journey would help remedy, and his wish to study the Wahhabi movement, which was then exerting a decisive influence on Islam across the Arabian Peninsula. On a personal level, he felt alienated from what he saw as the superficiality of European civilisation and was drawn to the romantic ideal of the unspoiled Orient.

In 1843 he travelled via Marseille and Constantinople to Cairo, where he got to know the customs of the Middle East and the rudiments of Islam. He adopted a simple way of life and passed himself off as a Muslim, taking the name Abd al-Wali, to allow him to get closer to Muslim society. While many people believe Wallin converted to Islam, there is no proof to support this claim in his diaries and letters, and his writings rather indicate scepticism toward religion.^{[citation needed]}

In 1845, he began his first expedition to visit Mecca, a city forbidden to non-Muslims. This expedition took him from Cairo via Ma'an, Al-Jauf, Jubba and Ha'il to Medina, Mecca and Jeddah, from where he returned to Cairo. On his second expedition in 1846, he visited Palestine and Syria. His third expedition in 1847 had been intended to explore the Wahhabi region of Najd, but on reaching Ha'il he realized that his identity as a Muslim had been compromised, so he turned north and travelled in Mesopotamia and Persia before returning via Baghdad and Damascus to Cairo in 1849.

He wrote that he found European culture oppressive and that he felt estranged from Europe after his years in the East. By 1850, Wallin had returned to Europe, where the British Royal Geographical Society published his Notes taken during a Journey through part of Northern Arabia and awarded him its gold medal in recognition of his ground-breaking research. He also received a prize from the East India Company and a silver medal from the Société de Géographie. Wallin completed his doctoral thesis in 1851 and was subsequently appointed Professor of Oriental Literature at the University of Helsinki.

Both the Royal and Russian Geographical societies sought to fund another expedition to Southwest Asia, but negotiations stalled; Wallin died before any agreement was reached.^{[citation needed]} Wallin died unexpectedly on 23 October 1852, only three years after his return to Finland and a day before his forty-first birthday.

The Finnish translators of Wallin's letters have described him as a kind of "patron saint of Finnish oriental research". The Finnish Oriental Society [fi] holds its annual meeting on his birthday. Internationally, his qualifications have been compared to those of U. J. Seetzen and J. L. Burckhardt, and he has been characterised as the first modern Arabian explorer to prepare thoroughly for his mission. His grave in Hietaniemi Cemetery, a Christian cemetery in Helsinki, displays his name Georg Aug. Wallin with his Arabic name Abd al-Wali in Arabic letters beneath it.^{[citation needed]}