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The multicomponent backbone N‐modification of peptides on solid‐phase is presented as a powerful and general method to enable peptide stapling at the backbone instead of the side chains. This work shows that a variety of functionalized N‐substituents suitable for backbone stapling can be readily introduced by means of on‐resin Ugi multicomponent reactions conducted during solid‐phase peptide synthesis. Diverse macrocyclization chemistries were implemented with such backbone N‐substituents, including the ring‐closing metathesis, lactamization, and thiol alkylation. The backbone N‐modification method was also applied to the synthesis of α‐helical peptides by linking N‐substituents to the peptide N‐terminus, thus featuring hydrogen‐bond surrogate structures. Overall, the strategy proves useful for peptide backbone macrocyclization approaches that show promise in peptide drug discovery.