This study aims to determine the effect of retrowalking programme (RWP) on walking patterns and functional abilities in knee osteoarthritis patients with a pretest-posttest quasi-experimental design with 2 groups. The sample in this study amounted to 30 people who were randomly divided into 2 groups. The first group (experimental group) was given conventional physiotherapy intervention and RWP and the second group (control group) was only given conventional physiotherapy intervention. Before the intervention was given, a pretest was conducted in the form of a GAIT questionnaire to assess walking patterns and WOMAC to assess functional abilities in knee OA patients. Post test was conducted after both groups were given intervention 3 times a week for 5 weeks. The paired T test was used to determine changes before and after treatment in both groups. Then an unpaired T test was conducted to determine the comparison of effectiveness between the two groups. The results showed that there was a decrease in GAIT and WOMAC scores in both groups (p=0.000). The comparison test of the two groups showed that the difference in GAIT values in the experimental group was 10.47 ± 3.50 higher than the control group 7 ± 2.23 with a value of p = 0.003. The difference in WOMAC scores in the experimental group 20.93±5.02 was higher than the control group 11.33±3.15 with a value of p = 0.000. Conventional physiotherapy intervention combined with RWP is more effective than conventional physiotherapy intervention alone in improving walking patterns and functional abilities in knee OA patients.