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Little is known about health-related quality of life (HRQoL) in immunocompromised people during and after COVID-19 illness. We describe HRQoL outcomes from the EPIC-IC trial, which included participants with immunocompromise and mild–moderate COVID-19. EPIC-IC was a randomized, double-blind trial. Participants were assigned 1:1:1 to 5-day, 10-day, or 15-day nirmatrelvir-ritonavir (NMV/r) and completed the SF-36 and EQ-5D-5L through Week (W)24. HRQoL was analyzed across and by treatment arms for the evaluable population (N = 150) and in post hoc subpopulations with severe (n = 57) and non-severe (n = 93) immunocompromise. Mixed-effects longitudinal models compared 5-day vs. 10-day or 15-day NMV/r. In the overall sample, mean baseline SF-36 domain scores (norm-based; mean = 50, SD = 10) ranged from 35.7 to 44.1, mean Physical Component Summary (PCS) score was 37.9, and mean Mental Component Summary (MCS) score was 41.5 – all substantially worse than cancer comparator norms and age-matched general population (AMGP) norms. Baseline mean EQ-5D-5L Index score was 0.65; participants reported problems with pain/discomfort (90% of participants), usual activities (73%), mobility (50%), anxiety/depression (48%), and self-care (29%). These proportions improved through Day (D)15 (change from baseline [CFB]: − 49%-points for pain/discomfort, − 38%-points usual activities, − 22%-points mobility, − 24%-points anxiety/depression, − 19%-points self-care) and then stabilized. From the earliest post-baseline assessment (EQ-5D-5L: D5, SF-36: D10), all overall-sample outcomes improved significantly (-5D-5p < 0.05), with all mean improvements exceeding published minimum important difference thresholds (SF-36: 2–4-point; EQ-5D-5L Index: 0.03–0.05-point). Mean EQ-5D-5L Index score surpassed AMGP norms from D5 and peaked at D15 (0.21-point CFB). Mean SF-36 outcomes improved through W12; PCS surpassed AMGP norms at W12, while MCS approached but remained below AMGP norms. Improvements were sustained through W24 (W24 CFB: PCS, 10-point; MCS, 8-point; EQ-5D-5L Index, 0.20-point). EQ-5D-5L improvements appeared similar across immunocompromised subpopulations, whereas SF-36 improvements appeared slower and smaller in severely vs. non-severely immunocompromised participants. No significant treatment-arm differences were observed, except lower D10 PCS scores among severely immunocompromised participants treated with 5-day vs. 10-day NMV/r (p = 0.03). Immunocompromised individuals with mild–moderate COVID-19 experienced various HRQoL decrements, followed by rapid improvements during treatment that were sustained through W24. Interpretation is limited by the absence of an untreated control group. Clinical trial number: NCT05438602. Registry: ClinicalTrials.gov. Registration date: June 28, 2022. URL: https://clinicaltrials.gov/ct2/show/NCT05438602. People with weakened immune systems (called immunocompromised) are at higher risk of serious illness from COVID-19, but little is known about how they feel and function during COVID-19 illness or recovery. This study looked at how COVID-19 affected the health and well-being of immunocompromised people who took part in the EPIC-IC clinical trial. In this trial, immunocompromised participants with mild to moderate COVID-19 were randomly chosen to receive 5, 10, or 15 days of the antiviral medicine nirmatrelvir-ritonavir (NMV/r). Participants completed questionnaires about their health-related quality of life (HRQoL) when they joined the study and during 6 months of follow-up. A questionnaire called the EQ-5D-5L asked participants 5 questions about their current pain or discomfort, anxiety or depression, and how well they could care for themselves, get around, and do their usual activities. Another questionnaire, called the SF-36, asked participants 36 questions about their physical and mental health over the last week and how their health has affected their daily and social activities. At the start of the study (during the first days of COVID-19 illness), participants reported much poorer health and functioning than people of similar age in the general population and people with cancer. Common problems included pain, fatigue, difficulty doing usual activities, and anxiety/depression. On average, participants showed clinically meaningful improvements across all parts of HRQoL within the first 2 weeks of treatment, and these gains were maintained through 6 months. Physical health scores reached population averages after 12 weeks in the study, whereas mental health scores improved but stayed somewhat below average. People with severe immune problems had better physical health scores at Day 10 of the study if they had been chosen to take 10 days instead of 5 days of treatment. Overall, people with immune problems had quick and long-lasting recovery of HRQoL during and after NMV/r treatment. The length of NMV/r treatment (5, 10, or 15 days) did not make a major difference in HRQoL recovery.