Typical, but for me it's Ocarina of Time. I have beat it every year since I first beat it in 1999. A lot of memories with that game, I even remember seeing the commercials. Loved it so much my stepdad back then knew to give me Majora's Mask for Xmas! (although he forgot the expansion back lol)

Also this is kinda random but Gex: Enter the Gecko. Played that so much as a kid and get nostalgic just thinking about it. Sonic 2 is the first game I also remember vividly playing.

Another one for me is Resident Evil 4. Still remember playing that one a ton and enjoying it. Halo 2 multiplayer battles also give me a nasty case of nostalgia.

Others: Devil May Cry, Diddy Kong Racing, Super Mario 64, Final Fantasy VII, Mega Man Legends, Gears of War, Halo 1 and 3, Grand Theft Auto: Vice City, Mortal Kombat II, Super Mario World, Altered Beast, Crash Bandicoot 2, Tony Hawk's Pro Skater 2, Ninja Gaiden, etc. etc. Kinda makes me miss old school gaming!

Crash Team Racing, Crash Twinsanity, and Bloody Roar 3 are so nostalgic to me. I even have nostalgia for games I've played in the last few years which is a little weird.

Edit: I'm also very nostalgic when it comes to Smash Bros. Melee and Sonic Adventure 2, even though I never owned them when I was younger (and I still don't own Melee).

Smash Bros 4 cause of all the old characters + game themed stages + original/remastered music = Nostalgia rape

Mega Man 1-5, Mike Tysons Punch Out, Little Big Adventure 1-2, Starcraft, Quake World, Heroes of Might and Magic 2-3 (the HD version upcoming in 3 weeks!) just to name a few...

Super Mario Bros. 3, Super Mario Bros, Super Mario Bros. 2, Mega Man 4, Gargoyle Quest 2 (extremely underrated), Diddy Kong Racing, Duck Hunt, Elevator Madness, Excite Bike, The Legend of Zelda, Bomber Man, Mach Rider, and Pokemon Stadium 2.

Age of Empires 2. All the hours that I spent making custom maps, wow that game was my childhood. I can't even count the amount of time I spent in that game.

First Crash Bandicoot
Resident Evil 2-3+ Code Veronica
MGS 1
FF VII
Dino Crisis
Wipeout
Halo 1
Age of Empires 2
C&C Red Alert 2

Just a few to round off the top of my head.

Lucasfilm Games, Sid Meier's games, Chris Hülsbeck's music, the intro of Summer Games...

The first Ratchet & Clank. Half an hour with that and the nostalgia juices start flowing. Before i know it I've played through both trilogies, Gladiator and Size Matters again :p

Ratchet & Clank 1-3
Fable
Legacy of Kain: Defiance
Wipeout: Fusion
Gran Turismo 2
Tekken 3
Pokemon Silver version
Heroes of Might & Magic 3
Crash Team Racing
Rayman 2: The Great Escape

Those were the days my friend...