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Cross‐coupling reactions are essential tools in target molecule synthesis. However, the use of highly reactive organometallic reagents limits their applicability. Here, we present a mechanochemical Pd‐catalyzed cross‐coupling reaction between aryl halides and organozinc pivalates that can be carried out under ambient temperature and atmosphere. This operationally simple procedure affords a wide range of biaryl and aryl‐heteroaryl derivatives in high yields and short times. The reaction tolerates various functional groups and can be realized on a synthetically useful scale. Its practical value was demonstrated in the short synthesis of the pharmaceutical diflunisal.