20-oxoleukotriene B4 is a leukotriene that is leukotriene B4 bearing an additional oxo substituent at position 20. It has a role as a metabolite. It is a leukotriene, a dihydroxy monocarboxylic acid, a hydroxyaldehyde, a polyunsaturated fatty acid, a long-chain fatty acid and an omega-oxo fatty acid.