How many dungeons/boss fights are mandatory for storyline?

[Rhona]

I did the run of them around levels 15 to 20. Now I have another to do. So I'm just wondering is there going to be many more that HAVE to be done to progress the story quest line? Ta

[Tanoxis]

There are a few. I dont know the exact number, but there are around 12 to 15 instances in the main story I think.

[Peptaru]

9 or 10 dungeons, 4 or 5 instanced fights... so 13-15.

[Olyvar]

This is a complete list of the main scenario quests - wow there are a lot!

http://uk.ign.com/wikis/final-fantasy-xiv/Main_Scenario

[Enkidoh]

From what I remember, not including solo-instanced battles:

Dungeons:

Sastasha Seagrot
Tam Tara Deepcroft
Copperbell Mines
Thousand Maws of Toto Rak
Haukke Manor
Brayflox's Longstop
Stone Vigil
Castrum Meridiaum
The Praetorium

Party Boss fights (ala, 'trials' in the Duty Finder)
Bowl of Embers (Ifrit)
The Navel (Titan)
The Howling Eye (Garuda)
Cape Westwind (Rhitalyn sas Arvina)

I haven't included optional dungeons, dungeons required for Grand Company promotion, dungeons needed for the 2.1/'Chronicles of a New Era' story (which is all set after the 'main' storyline), or solo story boss fights like storming Castrum Centri, as there's probably too many to list here. Nor have I included the series of boss fights in the Praetorium as the 'final' battles for the game. But these are the party dungeon/boss fights I can remember.

EDIT: forgot Brayflox's (not surprising - I'm sure most of us would rather forget that hellhole even exists. ).

[Joven]

EDIT: forgot Brayflox's (not surprising - I'm sure most of us would rather forget that hellhole even exists. ).

I actually enjoy Brayflox...

[Bixby]

The main scenario goes further in 2.1, and includes:
-The Sunken Temple of Qarn
-Hero on the Halfshell (guildhest)
-More than a Feeler (guildhest)
-Good King Moggle Mog XII (primal trial)

Edit: And in order to unlock Hero on the Halfshell, then More than a Feeler, you also have to do all the other guildhests before them:
-Basic Training: Enemy Parties
-Under the Armor
-Basic Training: Enemy Strongholds
-Pulling Poison Posies
-Stinging Back
-All's Well that Ends in the Well
-Flicking Sticks and Taking Names

[BlueMage]

Dungeons and boss fights are pretty much all you'll be doing in the game, really.