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Here, we introduce a sustainable, bottom\u2010up strategy to fabricate hybrid boron nitride\u2013amyloid fibril (BNAF) aerogels, in which whey protein amyloid fibrils serve as renewable scaffolds that assist the organization of BN\u2010rich domains. A mild ultrasonication\u2013freeze\u2010drying process yields ultralight aerogels with hierarchical porosity, increased BN\u2010like ordering relative to the protein\u2010free control, and fibril\u2010induced reinforcement. The hybrid aerogels combine mechanical reinforcement, thermal stability under moderate\u2010use conditions, and strong acoustic performance, achieving sound absorption coefficients above 0.8, noise reduction coefficients up to 0.63, and sound transmission losses of 25\u201330\u00a0dB. This combination of low density and strong sound shielding compares favorably with common lightweight acoustic materials such as fiberglass, establishing amyloid\u2010assisted BN\u2013protein hybrid aerogels as promising candidates for moderate\u2010temperature, weight\u2010sensitive noise\u2010reduction applications.<\/jats:p>","DOI":"10.1002\/adma.74088","type":"journal-article","created":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T08:11:52Z","timestamp":1784275912000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Hybrid Amyloid\u2013Boron Nitride Aerogels for Lightweight Sound Insulation"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6265-3811","authenticated-orcid":false,"given":"Mohammad","family":"Peydayesh","sequence":"first","affiliation":[{"name":"ETH Zurich Department of Health Sciences and Technology  Zurich 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