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Flexible plasmonics on polymeric and non‐planar substrates are demonstrated using nanostencil lithography. Remarkable precision with 10‐nm accuracy is illustrated by fabricating sub‐100 nm plasmonic particles with sub‐50 nm interparticle distances. Hatice Altug and coworkers show optical tuning with mechanical stretching of polymer substrate and demonstrate nanopatterning on curved surfaces including optical fibers.