We found three new variations in the OX40 ligand (OX40L, CD134L) gene and its 5′ upstream region. −921 (G → A) at 5′ upstream region, −19 (C → G) at 5′ untranslated region, and 202+25 (G → T) at intron 2 were identified. −921 (G → A) and 202+25 (G → T) were detected in a substantial proportion of healthy Japanese individuals and were considered to be single nucleotide polymorphisms (SNPs). −19 (C → G) was detected in only one healthy individual. There was no association between these variations and the presence of rheumatoid arthritis (RA) or systemic lupus erythematosus (SLE).