Chronic lymphocytic leukemia (CLL) is the most common leukemia in the Western world. Since in most cases CLL remains an incurable disease, the goals of therapy are to improve quality of life and to prolong survival. This study will evaluate the participant's related outcomes and experience of CLL in adult participants who are treated in the Spain. Study participants will receive oral treatments for CLL as prescribed by their study doctor in accordance with approved local label. Adult participants prescribed various treatments will be enrolled. Around 132 participants will be enrolled in the study in sites in Spain. Participants will receive oral treatments for CLL according to the approved local label. The overall study duration will be 18 months. There is expected to be no additional burden for participants in this trial. All study visits will occur during routine clinical practice.