Wood-plastic composites (WPCs) are environmentally friendly materials that combine wood fibers with thermoplastics, offering a balance between mechanical performance and sustainability. Their recyclability and ability to reduce plastic waste make them important materials in circular economy strategies. In this study, WPCs were produced using wood fiber (WF) reinforced polypropylene (PP) and bio-based polyamide 11 (PA11) matrices to evaluate their structural and functional properties. However, undesirable odor emissions limit their use in interior applications. To address this issue, Halloysite Nanotubes (HNT) and Modified Halloysite Nanotubes (Mod-HNT), which have nanoscale size, lumen structure, and absorption and adsorption abilities, were compared with β-Cyclodextrin (β-CD), which has a toroidal structure that enables the encapsulation of hydrophobic molecules and the adsorption of aromatic hydrocarbons. WPCs containing 30 wt.% WF were produced with 2 wt.% and 5 wt.% of these additives. Odor analyses using Jar tests and HS-GC-MS showed that odorous VOCs such as Nonane, 5-butyl, and Furfural in PP-based WPCs were reduced by up to 27 percent with HNT and Mod-HNT, and by 96 percent with Mod-HNT alone. Tensile tests revealed a significant increase in tensile strength, especially in PP-based composites with Mod-HNT. These findings demonstrate that Mod-HNT and β-CD can effectively improve both odor reduction and mechanical performance in sustainable WPCs.