Mild‐mannered MOFs: A selective and efficient palladium‐catalyzed CH phenylation of a UMCM‐1‐type metal–organicframework (MOF) under mild conditions is reported. This highly regioselective postsynthetic modification obviates the need for a pre‐existing classical functional group at the reaction site (see scheme). The concept of site‐specific CH activation could potentially be extended to many classes