NOTREDAMECHIEF
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It depends on your defintion of "fan". If you count anyone who self-identifies as a fan of team X, I doubt anyone touches Notre Dame. If you make a quantitative cutoff, say people who self-identify as a fan of team X, and can name at least five starters on said team, I think it's quite likely that OSU has more.
Another way to judge fan base is to look at how much team products were sold. As I remember it, OSU has the largest take from merchandise so there for, the largest fan base.
A better question might be as between Texas and Ohio State... I know the Burnt Orange Texas hat shows up all over the place (Including the Michigan v. Nebraska Alamo Bowl)