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The association of ferulic acid, an alkali‐extractable phenolic acid in amaranth (Amaranthus caudatus L., Amaranthaceae) insoluble fiber (trans‐ferulic acid: 620 μg·g^–1, cis‐ferulic acid: 203 μg·g^–1), and non‐starch polysaccharides was investigated. Enzymatic hydrolysis of insoluble amaranth fiber released several feruloylated oligosaccharides that were separated using Sephadex LH‐20‐chromatography and reversed phase‐high performance liquid chromatography (RP‐HPLC). Three compounds were unambiguously identified: O‐(6‐O‐trans‐feruloyl‐β‐D‐galactopyranosyl)‐(1→4)‐D‐galactopyranose, O‐(2‐O‐trans‐feruloyl‐α‐L‐arabinofuranosyl)‐(1→5)‐L‐arabinofuranose, and O‐α‐L‐arabinofuranosyl‐(1→3)‐O‐(2‐O‐trans‐feruloyl‐α‐L‐arabinofuranosyl)‐(1→5)‐L‐arabinofuranose. These feruloylated oligosaccharides show that ferulic acid is predominantly bound to pectic arabinans and galactans in …