The WAT-TACE dataset comprises four key components: clinical data, imaging, segmentations, and radiomic features. The dataset includes clinical variables and outcome measures for 233 patients (median age: 66 years; 185 male, 48 female), with a median overall survival of 27 months and a median progression-free survival of 18 months. Imaging data consists of contrast-enhanced CT scans across multiple phases, including precontrast, late arterial, portal venous, and delayed phases. Segmentation data include 377 HCC lesion masks and 104 organ volumes of interest (VOIs) per patient. Additionally, radiomic feature extraction yielded more than 3000 features across all VOIs, presented in tabular format. The dataset is publicly available for research and model development.