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WhosDaDungeonMaster
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Wait... what? Are people now arguing that you can't make a shove as an opportunity attack? Seems pretty clear on pg 195 of the PHB to me. Am I missing something here?
[SECTION]OPPORTUNITY ATTACKS
You can make an opportunity attack when a hostile creature that you can see moves out of your reach. To make the opportunity attack, you use your reaction to make one melee attack against the provoking creature. The attack interrupts the provoking creature's movement, occurring right before the creature leaves your reach.[/SECTION]
And...
[SECTION]SHOVING A CREATURE
Using the Attack action, you can make a special melee attack to shove a creature, either to knock it prone or push it away from you. If you're able to make multiple attacks with the Attack action, this attack replaces one of them.[/SECTION]
Therefore, use Shove as your melee attack during your Attack of Opportunity. Why not? And, to me, Crawford's Sage Advice ruling from 2015 dodges the question, though that is an entirely different action.
Since the tone has changed to a slightly off-topic I'll chime in. The point some of you seem to be missing (sorry, DM Dave1) is the first words of Shoving a Creature: "Using the Attack action, you can make a special melee attack to shove a creature,..."
You can only use the Attack action on your turn, not on another's turn. On another's turn you can only take Reactions (and Legendary Actions). Since Opportunity Attacks are taken on another's turn, you can't Shove as a Reaction as part of the OA.
The concept of the OA as a Reaction is because you are acting more quickly than usual, making a hasty swing as a foe leaves your reach. The reason the Opportunity Attack allows you to "make one melee attack" instead of granting you an Attack action is so with Extra Attack, characters aren't making two or more swings as Reactions when granted the OA.
Any other understanding really becomes a house-rule, which is fine, but not RAW.