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Background: Cognitive Remediation Therapy (CRT) targets specific thinking styles that are thought to play a role in the development and maintenance of anorexia nervosa (AN). Evidence is emerging to support its use for young people diagnosed with AN, but less is known about its benefit when delivered as a brief group intervention. Even less is known about its potential benefit for those with high Autism Spectrum Disorder (ASD) features. Aims: This is the first study to explore the feasibility of brief group CRT in young people diagnosed with AN using neuropsychological measures of both set-shifting (SS) and central coherence (CC), and to consider the benefit for those with ASD features. This pre and post uncontrolled feasibility study aimed to i) establish recruitment and intervention retention rates, ii) estimate the likely effect size of group CRT with young people with AN using a range of neuropsychological assessment measures, and iii) establish characteristics of the CRT outcome measures (suitability to pre and post design). A second aim was to perform exploratory preliminary analysis using the data collected (not outcome analysis) to explore whether improvements in SS and CC may relate to (i) changes in weight restoration, and (ii) ASD features. Methods: Twenty-two young people aged 12-18 years receiving intensive day-patient treatment for AN or Atypical AN completed a neuropsychological assessment (two experimental measures of SS - the Wisconsin Card Sorting Task and the Brixton Spatial Anticipation Test - and one of CC - The Rey Osterrieth Complex Figures Task) pre and post 4 sessions of group CRT that was offered as part of their standard eating disorder treatment. The motivational ruler and standard measures of AN symptom severity, distress, and ASD features were also used. Results: Study uptake was 95%, intervention retention was 91%, and group CRT was rated as acceptable. Medium to large effect size improvements were found across measures of SS (dz=0.44 to dz=0.90) and medium size improvements found in CC (dz=0.59). There was a moderate (not significant) correlation between change scores in weight restoration and CC and one measure of SS and no correlation between cognitive improvement following group CRT and academic functioning. Young people with ASD features showed smaller to similar size improvements in SS, and larger improvements in CC following group CRT. Conclusions: This study suggests that an RCT examining group CRT in AN using neuropsychological measures and 4 sessions as a 'minimum dose' is feasible to conduct within a daypatient setting. Important study parameters have been estimated in order to plan a future definitive trial evaluating the effectiveness of group CRT in young people with AN. The Wisconsin Card Sorting Task and the Rey Osterrieth Complex Figures Task offered suitable measurement of pre and post change in SS and CC respectively, while the Brixton Spatial Anticipation Test was less suitable for use with this study design in this population. Group CRT is likely to benefit young people with AN with or without ASD features.