The country of Senegal is named after the Senegal River. The name of the river may derive from a Portuguese transliteration of the name of the Zenaga, also known as the Sanhaja. Alternatively, it could be a combination of the supreme deity in Serer religion (Rog Sene) and o gal meaning body of water in the Serer language. French author and priest David Boilat put forward the theory that the name derives from the Wolof phrase "sunuu gaal", which means "our canoe".

Archaeological findings throughout the area indicate that Senegal was inhabited in prehistoric times and has been continuously occupied by various ethnic groups. Some kingdoms were created around the seventh century: Takrur in the sixth century, Namandiru and the Jolof Empire during the 13th and 14th centuries. Eastern Senegal was once part of the Ghana Empire.

Islam was introduced through Toucouleur and Soninke contact with the Almoravid dynasty of the Maghreb, who in turn propagated it with the help of the Almoravids and Toucouleur allies. This movement faced resistance from ethnicities of traditional religions, the Serers in particular.

In the 13th and 14th centuries, the area came under the influence of the empires to the east; the Jolof Empire of Senegal was also founded during this time. In the Senegambia region, between 1300 and 1900, close to one-third of the population was enslaved, typically as a result of being taken captive in warfare.

In the 14th century the Jolof Empire grew more powerful, having united Cayor and the kingdoms of Baol, Siné, Saloum, Waalo, Futa Tooro and Bambouk, or much of present-day West Africa. The empire was a voluntary confederacy of various states rather than being built on military conquest. The empire was founded by Ndiadiane Ndiaye, a part Serer and part Toucouleur, who was able to form a coalition with many ethnicities, but collapsed around 1549 with the defeat and killing of Lele Fouli Fak by Amari Ngone Sobel Fall.
In the mid-15th century, the Portuguese landed on the Senegal coastline, followed by traders representing other countries, including the French. Various European powers—Portugal, the Netherlands, and Great Britain—competed for trade in the area from the 15th century onward.

In 1677, France gained control of what had become a minor departure point in the Atlantic slave trade: the island of Gorée next to modern Dakar, used as a base to purchase slaves from the warring chiefdoms on the mainland.

European missionaries introduced Christianity to Senegal and the Casamance in the 19th century. It was only in the 1850s that the French began to expand onto the Senegalese mainland, after they abolished slavery and began promoting an abolitionist doctrine, adding native kingdoms like the Waalo, Cayor, Baol, and Jolof. French colonists under Governor Louis Faidherbe progressively invaded and took over all the kingdoms, except the Serer Kingdoms of Sine and Saloum.

Yoro Dyao was …

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Senegal is a republic with a presidency; the president is elected every five years as of 2016, previously being seven years from independence to 2001, five years from 2001 to 2008, and seven years again from 2008 to 2016, by adult voters. The first president, Léopold Sédar Senghor, was a poet and writer, and was the first African elected to the Académie française. Senegal's second president, Abdou Diouf, later served as general secretary of the Organisation de la Francophonie. The third president was Abdoulaye Wade, a lawyer. The fourth president was Macky Sall, elected in March 2012 and reelected in February 2019. On 25 March 2024, Bassirou Diomaye Faye became the fifth democratically elected president.

Senegal has more than 80 political parties. The unicameral parliament consists of the National Assembly, which has 150 seats (a Senate was in place from 1999 to 2001 and 2007 to 2012). An independent judiciary also exists in Senegal. The nation's highest courts that deal with business issues are the constitutional council and the court of justice, members of which are named by the president.
Currently, Senegal has a quasi-democratic political culture, one of the more successful post-colonial democratic transitions in Africa. Local administrators are appointed and held accountable by the president. Marabouts, religious leaders of the various Muslim brotherhoods of Senegal, have also exercised a strong political influence in the country especially during Wade's presidency. In 2009, Freedom House downgraded Senegal's status from "Free" to "Partially Free", based on increased centralisation of power in the executive. By 2014, it had recovered its Free status.

In 2008, Senegal finished in 12th position on the Ibrahim Index of African Governance. The Ibrahim Index is a comprehensive measure of African governance (limited to sub-Saharan Africa until 2008), based on a number of different variables which reflect the success with which governments deliver essential political goods to their citizens. When the Northern African countries were added to the index in 2009, Senegal's 2008 position was retroactively downgraded to 15th place (with Tunisia, Egypt and Morocco placing ahead of Senegal). As of 2012 , Senegal's Ibrahim Index rank has declined another point to 16th of 52 African countries.

On 22 February 2011, Senegal severed diplomatic ties with Iran, saying it supplied rebels with weapons which killed Senegalese troops in the Casamance conflict.

The 2012 presidential election was controversial due to President Wade's candidacy, as the opposition argued he should not be considered eligible to run again. Several youth …

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