Topic. The clinical experience with tumor necrosis factor-alpha (TNF-α) inhibitor treatment for moderate to severe ulcerative colitis from a single institute. Purpose. To review experiences from a single hospital in treating moderate to severe ulcerative colitis with a TNF-α inhibitor (golimumab). Methods. We retrospectively reviewed the clinical results [Mayo score, endoscopic score, mucosal healing rate, normal and inactive mucosal disease, serum C-reactive protein (CRP) level, serum erythrocyte sedimentation rate (ESR) level, white blood cell (WBC) count, and withdraw rate of steroid usage] of patients with moderate to severe ulcerative colitis (UC) treated in the Taichung Veterans General Hospital, Taiwan from July 1982 to October 2018. Treatment outcomes were recorded regularly in the outpatient clinic. The follow-up period included the following: (a) week 0, receive the inducing dose, (b) week 4, post-treatment follow-up 1, (c) week 14, post-treatment follow-up 2, and (d) week 38, post-treatment follow- up 3. Results. Among 107 patients diagnosed in our hospital, 23 patients (23/ 107, 21.5%) had moderate to severe UC and received golimumab treatment. We found significant decreases in patients' Mayo scores (mean score, from 9.6 to 3.7), endoscopic subscores (mean score, from 2.04 to 1), CRP level, WBC count, and ESR. The percentage of patients receiving steroids also decreased (from 95.7% to 38.9 %). Conclusion. TNF-α inhibitor therapy was effective for inducing and maintaining patients' clinical response for an average follow-up of 38 weeks.