To determine the effects of Bilimbi fruit leaf (BL) extract on the corrosion rate of stainless steel orthodontic wires. A total of 60 stainless steel orthodontic wires (0.7 mm in diameter) were divided randomly into 4 groups (n=15): negative control group (control), 3% Bilimbi fruit leaf extract (B03), 6% Bilimbi fruit leaf extract (B06), and 10% Bilimbi fruit leaf extract (B10). Samples were immersed in artificial saliva and incubated at a temperature of 37°C for 7 days. Subsequently, the rate of corrosion was determined using a weight loss measurement method. The data were then analyzed using one-way analysis of variance (ANOVA) followed by least significant difference (LSD) post hoc test (P < 0.05). One-way ANOVA showed a significance P-value of < 0.05 (P = 0.000). Post-hoc LSD test also showed that there was a significant difference between control and treatment groups, in which the group immersed in 10% of BL extract had the lowest corrosion rate compared to the other two experiment groups. In addition, the 10% BL extract group had the highest percentage inhibition efficiency compared to the other two groups (79.84%). It can be concluded that Bilimbi fruit leaf extract can inhibit corrosion of stainless steel orthodontic wires. Ten percent of BL extract demonstrated a greater corrosion inhibition efficiency compared to 3% and 6% of the extract.