Pieces of Heart are probably the BIGGEST side-quest in every Zelda game. You must collect 4 Pieces of Heart to increase your life by 1 Heart. In TWW, there are 44 pieces. That means 11 more HEARTS! Better get a move on!

Piece #__Location_____How to get it
1___Forsaken Fortress (A1)__From 2F Room 1, drop down to 1F Room 1. Move NE barrels to step on switch to open NW cell. Open the chest for the Heart.
2___Windfall Island (D2)____First time you win Battleship, w/o high score. It's at the door below Windmill.
3___Any Mailbox_____________From Rito Cheif for helping Komali.
4___CrescentMoonIsland (E1)_Use Treasure Chart #11.
5___Spectacle Isle (C2)_____Get it winning the Cannon Minigame the first time.
6___Pawprint Isle (E2)______On the central Island, cut the grass until you find a hole you can crawl in on the dome. Go inside and go in the hole. All it is is a small area with ChuChus. Defeat them until you find the chest. It holds the Heart.
7___DragonRoostIsland (F2)__In letter from Baito's Mother for doing 25+ letters in the minigame 2 twice.
8___DragonRoostIsland (F2)__With letter from Hoskit's girlfriend after you give Hoskit 20 Golden Feathers.
9___Six-Eye Reef (D4)_______Go in the Submarine and defeat the 3 Moblins and everything that pops out of the barrels. After that, a ladder falls and you can get the Heart.
10__Needle Rock Isle (A5)___Defeat Kangrocs, then use a Hyoi Pear to take control of a seagull. Fly to the tip of the needle and hit it. The fire around the chest holding the Heart will go out. Go back to Link and grab the Heart.
11__DiamondSteppeIsland(A6)_From Treasure Chart #23
12__Headstone Island (C7)___Use a Hyoi Pear and as a seagull, fly up to the top spire and fly into the heart. Easy.
13__Angular Isles (E7)______You must move around the block to make it to the top. If you do, you get the heart.
14__Five Star Isles (G7)____Get it from the submarine.
15__Seven Star Isles (F1)___Get it from the Big Octo!
16__FlightControlPlat. (G2)_After Magic meter upgrade, you get it the first time you win Birdman Game.
17__Tingle Island (C3)______Get it from the Big Octo.
18__Greatfish Island (B4)___Walk to the top of the Corkscrew path on the SE isle, to the Withered Deku Tree. Change the Wind West and glide to the top of the isle in the distance. From here, head north and walk to the steep wall. Look around the corner to see the heart. Change the Wind North and glide to the chest with the heart.
19__StoneWatcherIsland (C5)_Get it by destroying the platform's cannons.
20__Angular Isles (E7)______From Treasure Chart #15.
21__Star Island (B1)________Go to the West Side and bomb the boulder. Defeat every enemy and you get the chest.
22__Rock Spire Isle (B3)____Buy it for 950 Rupees at Beedle's Shop.
23__Rock Spire Isle (B3)____Bomb the Cannon Boats and one Ring of Light will hold a Heart.
24__Bomb Island (F5)________Bomb the top boulder and go down into the Cavern. In the first room, stun a Magtail and place it on the switch to open the door. Go on the narrow path and then stun the other two Tails and throw each one into the rings of fire, and that, the fire will dissappear and you can get the chest holding the heart.
25__SouthernFairyIsland(D6)_From Treasure Chart #4.
26__Last Deku Tree__________You get it from watering the Last Deku Tree.
27__Windfall Island (D2)____Get it from the first auction you go to at night. EBay!EBAY!
28__Windfall________________Maggie (used to be poor guy but now rich guy's daughter)needs a letter, but her father doesn't allow mailmen in. Talk to the bird in the cafe and he'll give you a letter. Give it to Maggie and you get a heart.
29__Windfall________________From Zunari for completing Trade Quest (Check My guide)
30__Windfall________________After freeing Tingle, you can challenge The Killer Bees to Hide and Seek. You find each at certain places. After seeing you, they run. Roll into them by keep pressing "A". They're found at: behind a bush behind the southern town wall, top of the big tree where the poor dude is. Roll into it to get him down. Third, Behind the Bomb Shop, and finally, behind the grave by Tott. You get a piece of heart for finding them.
31__Windfall(DX Pictobox req.) Talk to Linda, lady with orange dress, and she wants help going out with Anton. Say yes and take a picture of her. Show it to Anton and he goes to a date with her at the cafe tomorrow. Talk to her then and she'll give you the piece of heart.
32__Windfall________________You get it from Sam (guy on bench) for putting tons of Trading Quest Items on the pedastles.
33__Pawprint Isle (E2)______Treasure Chart #30.
34__Rock Spire Isles (B3)___Treasure Chart #2.
35__Three-Eye Reef__________Treasure Chart #38.
36__Forest Haven____________From Treasure Chart #31.
37__Five Star Isles (G7)____Treasure Chart #33.
38__Windfall________________Light windmill and guy by it will give you heart.
39__Windfall________________After lighting Windmill, fly to chest at night and get heart.
40__ThornedFairyIsland(G4)__Treasure Chart #5.
41__Bomb Island (F5)________Treasure Chart #20.
42__Outset Island___________Put bait by the dark soil Mesa's working to get the pig to dig and get your heart.
43__Outset__________________Hit Orca 500 Times.
44__Outset__________________Do all of Savage Labrynith. (Check my Triforce Guide.)