Chukwu is the supreme being of Igbo spirituality. In the Igbo pantheon, Chukwu is the source of all other Igbo deities and is responsible for assigning them their different tasks. The Igbo people believe that all things come from Chukwu (Chiukwu), who brings the rain necessary for plants to grow and controls everything on Earth and the spiritual world. They believe Chukwu to be an undefinable omnipotent and omnipresent supreme deity that encompasses everything in space and space itself.
Linguistic studies suggest that the name "Chukwu" is a portmanteau of the Igbo words "chi" ("spiritual being") and "ukwu" ("great"). In Nsukka, the supreme being is known as Ezechitoke, among the Western Igbo he is Olisaebuluwa (or Osebuluwa). Other names include Chineke and Obasi di n'elu. Each name emphasizes a different attribute.
Igbo spirituality states chi is the personal god of every Igbo that connects them to Chukwu.
Some scholars suggest that Chukwu evolved over time and was especially influenced by the Arochukwu oracle rather than being a single unchanged belief held uniformly across Igboland from the beginning.
Early Igbo Bible translations used Chukwu for both the Christian God and lesser deities, before later translators standardized Chineke for the supreme God and chi for minor gods.
Many Igbo Christians refer to the Christian God as Chukwu. Chukwu (Chu-kwu) is similar to "The Most High" and "The Almighty" instead of a name like "God" which is of Germanic origin. Chukwu in Igbo language means God the Almighty, the supreme and most high. Most Igbo names are attached to the supreme Being (God) example Ugo Chukwu, Ebere Chukwu and many more. The Igbo believe it is impossible for humans to conceive of the unlimited greatness of Chukwu. Many Igbo dialects refer to The Almighty by titles such as "Chukwu" (Chi Ukwu), "Chineke" (Chi Na Eke), "Chukwu Okike" (Chi Ukwu Okike), "Chiokike" (Chi Okike), "Chuku" (Chi Uku), "Ebili Ukpabi" (Ebili nu Ukpabi), and "Obasi" (Obi Alusi).