Standard Actions -  Attack of Opportunity? (yes/no)*

Attack (melee) - No
Attack (ranged) - Yes
Attack (unarmed) - Yes
Activate a magic item other than a potion or scroll - No
Aid another - Maybe**
Bull rush - Yes
Cast a spell (1 standard action casting time) - Yes
Concentrate to maintain an active spell - No
Dismiss a spell - No
Draw a hidden weapon (see Sleight of Hand skill) - No
Drink a potion or apply an oil - Yes
Escape a grapple - No
Feint - No
Light a torch with a tindertwig - Yes
Lower spell resistance - No
Make a dying friend stable (see Heal skill) - Yes
Overrun - No
Read a scroll - Yes
Ready (triggers a standard action) - No
Sunder a weapon (attack) - Yes
Sunder an object - Maybe†
Total defense - No
Turn or rebuke undead - No
Use extraordinary ability - No
Use skill that takes 1 action - Usually
Use spell-like ability - Yes
Use supernatural ability - No

* Regardless of the action, characters moving out of a threatened square usually provoke an attack of opportunity. This column indicates whether the action itself, not moving, provokes an attack of opportunity.
** If characters aid someone taking an action that would normally provoke an attack of opportunity, then the act of aiding another also provokes an attack of opportunity.
† If the object is being held, carried or worn by a creature, yes; if not, no.

Move Actions - Attack of Opportunity? (yes/no)*

Move - Yes
Control a frightened mount - Yes
Direct or redirect an active spell - No
Draw a weapon‡ - No
Load a hand crossbow or light crossbow - Yes
Open or close a door - No
Mount a horse or dismount - No
Move a heavy object - Yes
Pick up an item -Yes
Sheathe a weapon - Yes
Stand up from prone - Yes
Ready or loose a shield‡ - No
Retrieve a stored item - Yes

‡ A character with a base attack bonus of +1 or higher can combine these actions with a regular move. A character with the Two-Weapon Fighting feat can draw two light or one-handed weapons in the time normally needed to draw one.

Full-Round Actions - Attack of Opportunity? (yes/no)*

Full attack - No
Charge§ - No
Deliver coup de grace - Yes
Escape from a net - Yes
Extinguish fl ames - No
Light a torch - Yes
Load a heavy or repeating crossbow - Yes
Lock or unlock weapon in locked gauntlet - Yes
Prepare to throw splash weapon - Yes
Run - Yes
Use skill that takes 1 round - Usually
Use touch spell on up to six friends - Yes
Withdraw§ - No

§ May be taken as a standard action if the character is limited to taking only a single action in a round.

Free Actions - Attack of Opportunity? (yes/no)*

Cast a quickened spell - No
Cease concentration on a spell - No
Drop an item - No
Drop to the floor - No
Prepare spell components to cast a spell# - No
Speak - No

# Unless the component is an extremely large or awkward item

"No Action" Actions - Attack of Opportunity? (yes/no)*

Delay - No
5-foot step - No

Action Type Varies - Attack of Opportunity? (yes/no)*

Disarm†† - Yes
Grapple†† - Yes
Trip an opponent†† - Yes
Use feat‡‡ - Varies

†† These attack forms substitute for a melee attack, not an action. As melee attacks, they can be used once in an attack or charge action, one or more times in a full attack action, or even as an attack of opportunity.
‡‡ The description of a feat defines its effect.