The relationship between smoking cessation and weight gain is well recognized. Examining the link between smoking cessation and weight gain in donor candidates for living donor liver transplantation (LDLT) is an important topic because of the influence of weight gain on the liver. This study assessed body weight (BW) changes after smoking cessation in donor candidates for LDLT. The 27 donor candidates were retrospectively analyzed. The smoking status was determined based on questionnaires administered at the initial presentation, and the candidates were divided into 2 groups: recent quitters and nonsmokers. The changes in BW were compared between the groups. The recent quitters group included 10 (37.0%) candidates, and the nonsmokers group included 17 (63.0%). In the nonsmokers group, 1 candidate had gained weight since the initial presentation. In contrast, in the recent quitters group, 70.0% of candidates had gained weight since the initial presentation (P < .01). The change in BW from the initial presentation was greater in recent quitters than in nonsmokers (+1.6 kg +2.4% vs −0.5 kg −0.9%; P < .01). Two candidates in the recent quitters group gained ≥ 5 kg 8% of weight. One of these 2 candidates was judged to be in a donor-inadequate status because of the appearance of fatty liver. Weight gain due to smoking cessation was observed in donor candidates for LDLT. The amount of weight gain after smoking cessation is highly individualized, so everyone concerned with LDLT must be alert to its potential development. •Weight gain after smoking cessation was observed in living donor candidates for liver transplantation.•The amount of weight gain after smoking cessation is highly individualized.•One candidate whose weight rapidly increased was judged to be in a donor-inadequate status because of the appearance of fatty liver.