Yes. Any character who is proficient with a particular type of armor can cast spells while wearing that type of armor with no penalty. There are better ways for mages to get a decent Armor Class. For example, Draconic Sorcerers get permanent Mage Armor for free at 1st level, which provides 13 + Dexterity Modifier AC..
Accordingly, can I use Mage Armor on yourself?
No, sorry. You can wear leather armor (AC=11+DEX); if you do you cannot cast mage armor on yourself per its description. Or you can cast mage armor on yourself (AC=13+DEX) and not wear the leather.
Beside above, can you see mage armor? Depends on the mage. I'd rule that, in my games, Mage Armor can always be seen. But, it can range from a translucent, almost invisible field to an ornate, glowing breastplate or similar armor.
Subsequently, one may also ask, can you cast mage armor on multiple people?
There is also no reason you cannot cast Mage Armor more than once on different targets, assuming you have the available spell slots, since it is not concentration. You cannot have multiple copies of Mage Armor affecting a single creature, however -- or, rather, only one will have any effect.
Does Mage Armor stack with unarmored defense?
Mage armor is a magical force with no weight to it. It is not real armor. Unarmored Defense for a monk means being able to freely move, so mage armor does not interfere with Unarmored Defense.
Related Question Answers
Is Mage Armor a ritual?
Mage Armor is also not eligible to be cast as a ritual since the spell does not have the ritual tag. No, you cannot cast a spell without the ritual tag as a ritual. Since they normally couldn't cast spells, the rituals allow them to do so. Cast out of combat spells without a cost (other than time).Does Mage Armor stack with shield?
The key point on these two spells is that Mage Armor affects your base AC whereas Shield is a bonus to your AC. Since Shield and Mage Armor aren't the same spell their effects can overlap just fine. So yes, they stack.Can magic missile miss?
It is unique in this regard with respect to iconic D&D spells. Yes. There is an old saying in D&D "Magic Missile Never Misses." The idea, basically, is that it's a small amount of damage (per missile) that always hits it's target. The tipoff here is that it does not mention an attack roll or saving throw.Does Mage Armor stack with natural armor 5e?
Mage Armor and natural armor. It does not stack.Does Mage Armor stack with barbarian?
Similarly, Mage Armor sets it to 13+Dex modifier and a barbarian's Unarmored Defense sets it to 10+Dex modifier+Con modifier. These never stack.Does mage armor count as wearing armor?
Mage Armor says ends if the target dons armor or This spell does not give you armor—it gives you a protective magical force—so it has no effect on these abilities. Note that it does not stack with unarmored defence—you get whichever is better.Does mage armor work with armor?
As others have mentioned, mage armor provides an armor bonus, so its bonus does not stack with worn armor or any other source that provides an armor bonus. The only reason you'd really ever want to stack mage armor with worn armor is if you might be facing a creature with incorporeal attacks, such as a ghost.What is a warlock in D&D?
Warlocks are the magic users who cheated their way through Final exams. They're a really cool class who have made a Pact with a powerful entity, for some greater purpose; be it their soul, influencing events in the mortal plane for their chosen patron, or even cookies.Does Mage Armor stack with armor Pathfinder?
In Pathfinder, bonuses of the same type do not stack. Mage Armor and regular armor (full plate, etc.) both provide an armor bonus, so they do not stack. The same can be said for a shield and the spell Shield — they both apply a shield bonus to AC.Can you cast shield on someone else?
A reaction is an instant response to a trigger of some kind, which can occur on your turn or on someone else's. Therefore, yes, you can cast Shield as a reaction if you provoke an opportunity attack on your turn.What does Mage Armour do?
Mage Armor is intended to help classes that can't wear armor without suffering huge penalty (such as Wizards themselves) or classes that would prefer to go unarmored (such as Barbarians).Can warlocks use Mage Armor?
Warlocks don't get Mage armor, except as the invocation. It isn't on their spell list. The invocation itself is kinda silly to waste a slot on. You already have access to Light Armor.Can Wizards wear armor 5e?
Any character, including a Wizard, can wear any armor, though it is advisable for characters to only wear armor that they are proficient in.How do I know my AC 5e?
Here are some ways to calculate your base AC: Unarmored: 10 + your Dexterity modifier. Armored: Use the AC entry for the armor you're wearing (see PH, 145). For example, in leather armor, you calculate your AC as 11 + your Dexterity modifier, and in chain mail, your AC is simply 16.Can wizards use shields 5e?
The only ways for a wizard to gain shield proficiency are either multiclassing, or the Moderately Armored feat. Note that you can use a shield without proficiency - you just won't be able to cast spells, and you'll have disadvantage on any attack roll, saving throw, or ability check that involves Strength or Dexterity.Does Mage Armor require concentration?
Mage Armor lasts 8h and gives you +3 AC for the cost of a 1st level spell, without concentration. Barkskin lasts 1h and sets your AC to 16 (which, for a character with a decent Dex score, is the same thing or maybe a little better), but requires concentration, so it falls off as soon as you get hit.Do shields count as armor 5e?
No, wearing a shield does not count as Armor Shields are in the Equipment section (Chapter 5) of the PHB, but are not classified under the Armor section when determining Light, Medium, or Heavy Armor.What is unarmored defense?
Unarmored Defense While you are not wearing any armor, your Armor Class equals 10 + your Dexterity modifier + your Constitution modifier. Unarmored Defense While you are not wearing any armor, your Armor Class equals 10 + your Dexterity modifier + your Constitution modifier.Does Mage Armor stack with bracers of armor?
No, magical armor bonuses (from bracers, or the Mage Armor spell) do not stack with any other armor bonuses. They don't even stack with a shield. 
