WrestleMania is the annual flagship pay-per-view (PPV) event of World Wrestling Entertainment (WWE), widely regarded as "The Grandaddy of them all," or "The Showcase of the Immortals". The first WrestleMania was held on March 31, 1985 in New York's Madison Square Garden by WWE Chairman Vince McMahon.

WrestleMania is to WWE as the World Cup is to FIFA, Super Bowl is to the NFL, the World Series is to MLB, the Stanley Cup Finals is to the NHL, and the NBA Finals is to the NBA in the sense that it is the most important event of the year in sports entertainment. It is the largest & longest running of all major wrestling events in the world. Participating in its main event marks the pinnacle of a professional wrestler's career, and a hugely important source of revenue to WWE. Some fans of WWE call it one of the 'Big Four', (listing it as the single biggest of the four) as it was one of the original four annual WWE PPVs, along with the Royal Rumble, SummerSlam, and the Survivor Series. These four major PPVs bring together the RAW, SmackDown! and ECW brands onto the same card, something that hasn't been true of the remaining PPVs of the year since 2003.

• Since 1993, the winner of the annual Royal Rumble match receives a guaranteed title shot for the WWE Championship at that year's WrestleMania. Since the creation of the World Heavyweight Championship after the brand extension, the winner is now able to choose which champion they wish to face, even if they are not on the same brand.

• WrestleMania III was claimed by the World Wrestling Federation as setting an indoor attendance record of 93,173. It is the largest North American indoor crowd to witness a sporting event. (Years later, a dispute arose about this number with some critics claiming an attendance of 78,000, however, this dispute has never been fully resolved)

• Since 1993, the winner of the Royal Rumble has won the WWE Championship or the World Championship at WrestleMania every year except at WrestleMania XI, WrestleMania 13, WrestleMania XV, and WrestleMania 2000. WrestleMania X can also be included on this list because in 1994 Royal Rumble, both Bret Hart and Lex Luger were both declared winners and both received title shots against the current champion, Yokozuna. Luger lost his match, Hart won his.

• WrestleMania VI and X8 are the only WrestleManias to have been held outside of the United States, both being held at SkyDome (now the Rogers Centre), in Toronto, Ontario, Canada.

• The Undertaker holds the best record: 14-0.

• Other wrestler's undefeated streaks at WrestleMania include Edge at 5-0, Earthquake at 4-0, John Cena at 3-0, Rob Van Dam at 3-0 and Sable at 3-0.

• Triple H was the first heel to walk out of WrestleMania as a World Champion at WrestleMania 2000 and again at WrestleMania XIX.

• Randy Savage and Hulk Hogan are the only men to have a WWF Championship reign begin at one WrestleMania and end at another. Savage won the WWF title at WrestleMania IV by winning a tournament for the title and lost the title to Hogan at WrestleMania V. Hogan himself would go on to lose the title at WrestleMania VI to the Ultimate Warrior.

• Yokozuna is the only man to have a WWF Championship reign begin and end at the same WrestleMania. He won the title from Bret Hart and then lost it to Hulk Hogan 2 minutes 8 seconds later.

• WrestleMania IX was the only WrestleMania to be held completely outdoors. WrestleMania XIX was partially outdoors as Safeco Field's retractable roof doesn't fully enclose the stadium.

• Madison Square Garden (MSG) and the Allstate Arena have hosted the most WrestleManias. MSG hosted I, X, and XX. The Allstate Arena was one of the host venues for WrestleMania 2 and hosted WrestleManias 13 and 22.

• Only five men walked in and out of WrestleMania as World Champion: Hulk Hogan, Diesel, Triple H, Eddie Guerrero and John Cena.

• Steve Austin is the only man to have won the WWE Championship at two consecutive WrestleManias. At WrestleMania XIV against Shawn Michaels and at WrestleMania XV against The Rock.

• Triple H is the only man to have lost the World Heavyweight Title at two consecutive WrestleManias. At WrestleMania XX to Chris Benoit and at WrestleMania 21 to Batista. He is also one of only two men to have lost 3 consecutive WWE Championship/World Heavyweight Title matches (XX, 21, and 22) along with The Rock (XV, 2000, and X-Seven).

• WrestleMania X-Seven had the most title changes at a single WrestleMania (five): The European, Hardcore, Women's, Tag Team and WWE Championship all changed hands.

• WrestleMania I is the only WrestleMania to not hold a WWE Championship Match.

• Bret Hart competed at twelve consecutive WrestleManias - from WrestleMania 2 to WrestleMania 13, which is more than any other wrestler. He wrestled in thirteen matches during this streak (he wrestled two matches at WrestleMania X), compiling a win-loss record of 7-6.

• The only WrestleManias to feature repeated matches have been WrestleMania III/IV (both featuring a match between Hulk Hogan and André the Giant), WrestleMania IX/X (Bret Hart/Yokozuna), WrestleMania XIV/XX (Undertaker/Kane), WrestleMania 2000/X-Seven (Dudleyz/Hardyz/Edge and Christian), and WrestleMania XV/X-Seven/XIX (Stone Cold Steve Austin/The Rock). Steve Austin vs The Rock is the only match in WrestleMania history to be featured at three WrestleManias.

• Jerry Lawler has been on the commentary team at WrestleMania a record number of twelve times. He has called every WrestleMania since WrestleMania X, except WrestleMania X-Seven (Paul Heyman had replaced him at that time as a regular commentator).

• Rey Mysterio is the only wrestler to compete for both the Cruiserweight Championship and the World Heavyweight Championship at a WrestleMania.

• To date, only six WrestleManias have been held in stadiums (III, VI, VIII, X-Seven, X8, XIX), one outdoors (IX), and the rest have been in arenas.

• Only 8 wrestlers have won a WrestleMania match with a submission:
  • Tito Santana (WrestleMania: Figure-Four Leg Lock on The Executioner)
  • "Rowdy" Roddy Piper (WrestleMania III: Sleeper Hold on Adrian Adonis in a "Hair-Vs-Hair" Match)
  • "The Model" Rick Martel (WrestleMania VI: Boston Crab on Koko B. Ware)
  • Bret "Hitman" Hart at two separate events (WrestleMania XI: Chicken Wing Cross-Face on Bob Backlund in an "I Quit" Match; WrestleMania XIII: The Sharpshooter on "Stone Cold" Steve Austin in a "Submission" Match)
  • Steve Austin at WrestleMania XII with a Million Dollar Dream on Savio Vega
  • Chris Benoit (WrestleMania XX: Crippler Crossface on Triple H in a "Triple Threat" match also involving Shawn Michaels)
  • Kurt Angle (WrestleMania 21: Ankle Lock on Shawn Michaels)
  • John Cena (WrestleMania 22; STFU on Triple H).

• Steve Austin and Hulk Hogan have both won the WWE Championship three times at a WrestleMania.

• The longest match in WrestleMania history was the Iron man match between Bret Hart and Shawn Michaels which lasted about 61 minutes at WrestleMania XII. The shortest was The Hart Foundation vs the Bolsheviks at WrestleMania VI which lasted 19 seconds