This article is about the particular significance of the year 2005 to Nigeria and its people.

• President: Olusegun Obasanjo (PDP)
• Vice President: Atiku Abubakar (PDP)
• Senate President: Adolphus Wabara (PDP) (Until 5 April); Ken Nnamani (PDP) (Starting 5 April)
• House Speaker: Aminu Bello Masari (PDP)
• Chief Justice: Muhammad Lawal Uwais

• Abia State: Orji Uzor Kalu (PDP)
• Adamawa State: Boni Haruna (PDP)
• Akwa Ibom State: Victor Attah (PDP)
• Anambra State: Chris Ngige (PDP)
• Bauchi State: Adamu Mu'azu (PDP)
• Bayelsa State: Diepreye Alamieyeseigha (PDP)
• Benue State: George Akume (PDP)
• Borno State: Ali Modu Sheriff (ANPP)
• Cross River State: Donald Duke (PDP)
• Delta State: James Ibori (PDP)
• Ebonyi State: Sam Egwu (PDP)
• Edo State: Lucky Igbinedion (PDP)
• Ekiti State: Ayo Fayose (PDP)
• Enugu State: Chimaroke Nnamani (PDP)
• Gombe State: Mohammed Danjuma Goje (PDP)
• Imo State: Achike Udenwa (PDP)
• Jigawa State: Ibrahim Saminu Turaki (APP)
• Kaduna State: Ahmed Makarfi (PDP)
• Kano State: Ibrahim Shekarau (ANPP)
• Katsina State: Umaru Yar'Adua (PDP)
• Kebbi State: Adamu Aliero (APP)
• Kogi State: Ibrahim Idris (PDP)
• Kwara State: Bukola Saraki (PDP)
• Lagos State: Bola Tinubu (AC)
• Nasarawa State: Abdullahi Adamu (PDP)
• Niger State: Abdulkadir Kure (PDP)
• Ogun State: Gbenga Daniel (PDP)
• Ondo State: Olusegun Agagu (PDP)
• Osun State: Olagunsoye Oyinlola (PDP)
• Oyo State: Rashidi Adewolu Ladoja (PDP)
• Plateau State: Joshua Dariye (PDP)
• Rivers State: Peter Odili (PDP)
• Sokoto State: Attahiru Bafarawa (APP)
• Taraba State: Jolly Nyame (PDP)
• Yobe State: Bukar Ibrahim (APP)
• Zamfara State: Ahmad Sani Yerima (ANPP)

• May 30 - 1st Africa Movie Academy Awards take place in Yenagoa.^{[citation needed]}
• June 28 - Air Nigeria is established.^{[citation needed]}
• December 10 - Sosoliso Airlines Flight 1145 crashes at Port Harcourt International Airport.^[1]

• August 31 - Sam Okoye, football goalkeeper who represented Nigeria during the 1999 FIFA World Youth Championship born 1980.^{[citation needed]}