There are, indeed:
http://en.uesp.net/wiki/Skyrim:Command
http://en.uesp.net/wiki/Oblivion:Command_Humanoid
http://en.uesp.net/wiki/Morrowind:Command
That said, I think it would be super cheesy to allow this spell at all. Spellcasting is already almost like cheating since it's really hard to make a script for the AI to use it properly without making the game extremely slow and the AI extremely annoying (if seduction was bad, think of the AI casting random spells here and there with no evident purpose), but Command spells could be extremely unbalanced for several reasons.
1 - Pressing claims: Getting courtiers with claims is a traditional way of expanding your realm. But the way to control this is making inviting courtiers a difficult issue. If you could just lure with your spells anyone, expanding would be as simple as casting a command spell, landing the courtiers, pressing his claims and profit.
2 - Artefacts: Some lowborn courtiers hold artefacts that are quite difficult to find. But it's easier if they're part of your court, as your courtiers will probably support any plot against them. Again, the reasoning is the same: you could start to lure unwilling courtiers with good artefacts to your court, kidnap/imprison them and start delivering good quality items to your own courtiers and yourself in almost no time.
3 - Random courtiers: Vanilla CK2 has some limits difficult or impossible to circumvent that are usually used in many mods to prevent weird things from happening. If you could lure creatures from special courts (The Ideal Masters, the Order of Worms, the Guilds and so on), it may become even easier to mess the whole game.
Besides, we have some spells to improve the opinion of a courtier, which is something "similar" to the command spell and doesn't go beyond that. There would be, of course, several ways to prevent players from doing this, but at least it should be taken into account.