Year 2005 (MMV) was a common year of the Gregorian calendar that started on a Saturday.
- January 1 - The SpongeBob SquarePants Movie is released in theatres in Columbia.
- January 6 - The SpongeBob SquarePants Movie is released in theatres in Australia, New Zealand, and Argentina.
- January 7 - The SpongeBob SquarePants Movie is released in theatres in Central America.
- January 13 - The SpongeBob SquarePants Movie is released in theatres in Peru.
- January 28 - The SpongeBob SquarePants Movie is released in theatres in Spain.
- February 2 - The SpongeBob SquarePants Movie is released in theatres in Belgium.
- February 3 - The SpongeBob SquarePants Movie is released in theatres in the Netherlands.
- February 9 - The SpongeBob SquarePants Movie is released in theatres in France.
- February 11 - The SpongeBob SquarePants Movie is released in theatres in the United Kingdom and Ireland.
- March 1 - The SpongeBob SquarePants Movie is released on DVD in the United States.
- March 11 - The SpongeBob SquarePants Movie is released in theatres in Austria.
- March 13 - The SpongeBob SquarePants Movie is released in theatres in Turkey.
- March 17 - The SpongeBob SquarePants Movie is released in theatres in Russia, Singapore, and the Czech Republic.
- April 6 - The SpongeBob SquarePants Movie is released in theatres in the Philippines.
- April 8 - The SpongeBob SquarePants Movie is released in theatres in South Africa.
- April 16 - The SpongeBob SquarePants Movie is released in theatres in Indonesia.
- May 6 - Fear of a Krabby Patty and Shell of a Man premiered.
- May 13 - The Lost Mattress and Krabs vs. Plankton premiered.
- May 20 - Skill Crane and Good Neighbors premiered.
- June 10 - The SpongeBob SquarePants Movie is released in theatres in Denmark.
- June 17 - The SpongeBob SquarePants Movie is released in theatres in Norway.
- June 26 - The SpongeBob SquarePants Movie is released in theatres in Sweden.
- September 16 - The SpongeBob SquarePants Movie is released in theatres in Greece.
- September 23
- Selling Out premiered.
- The SpongeBob SquarePants Movie is released in theatres in Italy.
- Funny Pants premiered.
- The SpongeBob SquarePants Movie is released in theatres in South Korea.
- October 7 - Mermaid Man and Barnacle Boy VI: The Motion Picture premiered.
- October 14 - Enemy In-Law premiered.
- October 21 - Patrick SmartPants premiered.
- November 4 - SquidBob TentaclePants premiered.
- November 11 - Have You Seen This Snail? premiered.