Mutual Defense and Optional Preemptive Defense Pacts (often referred to as MDoPDPs) are a type of interalliance treaty wherein the signatory alliances agree to defend each other from attack by other alliances. Optionally, they may support each other in wars of preemptive defense (going on the offense as a means of defense), but this is not required.

MDoPDPs often work and function similarly to a Mutual Defense and Optional Aggression Pact (MDoAPs).

The best example of a MDoPDP was the one between Farkistan and the Grämlins.

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