Fission of uranium yields Xe135 by two routes: direct production and production by the β-decay of I135. The amount produced directly (independent yield) has been measured by comparison with the amount produced from I135. The independent fission yield of Xe135 is found to be 2.7 ± 1.0% of the cumulative yield of I135. Assuming this latter quantity to be 5.6% of all fissions, the independent yield of Xe135 is ∼0.15%. The half-life of Xe135 has been measured as 9.13 ±.05 hr.