Ingjald illråde or Ingjaldr hinn illráði (Ingold Illruler or Illready) was a semi-legendary Swedish king of the House of Ynglings, son and successor of King Anund, and the father and predecessor of King Olof Trätälja. As with many of the 5th-7th century Yngling Kings of Sweden, his historicity is contested. ^{[citation needed]}

Ingjald is mentioned in medieval historiographical sources including the Ynglinga saga, Historia Norvegiæ, Hervarar saga, Upplendinga Konungum, Þorsteins saga Víkingssonar and Íslendingabók. The setting of Þorsteins saga Víkingssonar is roughly the 7th century. Johannes Magnus in his 16th-century list of kings places Ingjald (Ingevallus, Ingellus) in AD 883. ^{[citation needed]}

Snorri Sturluson gave an extensive account on the life of Ingjald in the Ynglinga saga which is part of the Heimskringla.

The Ynglinga saga, a part of the Heimskringla relates that the viceroy of Fjärdhundraland was named Ingvar and he had two sons, Alf and Agnar, who were of the same age as Ingjald. Svipdag the Blind was the viceroy of Tiundaland, the province of Uppsala where the Tings and the Yule (Midwinter) sacrifices were held (see the Temple at Uppsala).

One midwinter, when Ingjald and Alf were six years old, many people had assembled at Uppsala for the sacrifices. Alf and Ingjald played, but Ingjald found that he was the weaker boy and became so angry that he almost started to cry (which was strange because people named Ingjald were known to be stronger than average). His foster-brother Gautvid led him to his foster-father Svipdag the Blind and told Svipdag about Ingjald's lack of manliness and strength. Svipdag said that it was a shame and the next day he gave Ingjald a roasted wolf's heart to eat. From that day, Ingjald became a very ferocious person and had a bad disposition and breath.^{[citation needed]}

Anund arranged a marriage for his son Ingjald with Gauthild, the daughter of the Geatish king Algaut, who was the son of Gautrek the Mild and the grandson of Gaut. Gautrek consented as he believed that Ingjald had inherited his father's disposition. Gauthild's maternal grandfather was Olof the Sharp-sighted, the king of Närke.

Snorri Sturluson relates that when his father Anund had died, Ingjald became the king of Sweden. The kings at Uppsala were the foremost among the kings of the various provinces since Odin ruled the country, and they were the supreme chiefs of the other kingdoms since the death of Agne and Sweden was divided between Erik and Alrik. The descendants of these two kings had spread, cleared land and settled new territories, until there were several petty kings.

In honour of his own ascendance to the throne, Ingjald invited the kings, the jarls and other important men to a grand feast in a newly built hall, just as large and sumptuous as the one in Uppsala. It was called the hall of the seven kings and had seven high seats. Algaut the Geatish king of West Götaland, King Ingvar of Fjädrundaland with his two sons Agnar and Alf, King Sporsnjall of Nerike and King Sigvat of Attundaland came, but not King Granmar of Södermanland. The kings filled all seven seats but one. All the prominent people of Sweden had seats, except for Ingjald's own court whom he had sent to his old hall in Uppsala.