There is no one "Main Quest" in The Elder Scrolls V: Skyrim, but rather a series of quests which lead the player through the main story arc. These are:
Main Quests 
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- Unbound
- Before the Storm
- Bleak Falls Barrow
- Dragon Rising
- The Way of the Voice
- The Horn of Jurgen Windcaller
- A Blade in the Dark
- Diplomatic Immunity
- A Cornered Rat
- Alduin's Wall
- The Throat of the World
- Elder Knowledge
- Alduin's Bane
- The Fallen
- Paarthurnax
- Season Unending
- The World-Eater's Eyrie
- Sovngarde
- Dragonslayer
- Unbound
- Before the Storm
- Bleak Falls Barrow
- Dragon Rising
- The Way of the Voice
- The Horn of Jurgen Windcaller
- A Blade in the Dark
- Diplomatic Immunity
- A Cornered Rat
- Alduin's Wall
- The Throat of the World
- Elder Knowledge
- Alduin's Bane
- The Fallen
- Paarthurnax
- Season Unending
- The World-Eater's Eyrie
- Sovngarde
- Dragonslayer