Chicken manure feedstocks containing suspended fine activated carbon catalyst were gasified by supercritical water gasification in an experimental pilot plant. A chicken manure feedstock of 2 wt% with 0.4 wt% of activated carbon was completely gasified, whereas the same feedstock without activated carbon was gasified with a carbon gasification efficiency of only 0.8. A feedstock of 10 wt% with 5 wt% of activated carbon was completed by gasified. Our results indicate that suspended fine activated carbon is effective as a gasification catalyst. The data also confirm that use of a suspended activated carbon catalyst helps to prevent plugging in the gasification reactor.