The main objective was to assess the link between emotional competence (EC) and adjustment outcomes such as supportive care needs (SCN) and anxious–depressive symptoms in cancer patients starting chemotherapy. The second objective was to assess the interaction effect between EC and the COVID‐19 pandemic (i.e. patients included before or during the pandemic) on these outcomes. At the beginning of care, 255 patients with digestive or hematological cancer, recruited before the pandemic began (n = 156, 61.2%) or during the pandemic (n = 99, 38.8%), completed the Short Profile of Emotional Competence, the Hospital Anxiety and Depression Scale, and the Supportive Care Needs Survey Short Form. Partial correlations and multiple regressions were used. Intrapersonal EC showed negative significant correlations with psychological unmet SCN (r = −.32, p < .001), anxiety (r = −.37, p < .001), and depression (r = −.46, p < .001). Interpersonal EC showed only significant interaction effects (p < .05): it was only associated with fewer unmet physical and daily SCN (p < .002) and fewer depressive symptoms (p < .004) during pandemic. Results show significant associations between intrapersonal EC and better adjustment of cancer patients from the early stage of care. Interpersonal EC seems to be a significant resource to deal with illness only in difficult contexts such as the COVID‐19 pandemic.