Several trimetallic ferrites with different ratios of Cu, Fe, and Mn were synthesized by direct decomposition method and tested for chemical looping combustion of methane, synthesis gas, and carbon. For comparison, several bimetallic ferrites were also tested, and NiFe<
sub>
2<
/sub>
O<
sub>
4<
/sub>
and CuFe<
sub>
2<
/sub>
O<
sub>
4<
/sub>
showed the best performance. During a 55-cycle test, trimetallic CuFeMnO<
sub>
4<
/sub>
showed better overall performance than both NiFe<
sub>
2<
/sub>
O<
sub>
4<
/sub>
and CuFe<
sub>
2<
/sub>
O<
sub>
4<
/sub>
, which had shown the best performance among the bimetallic ferrites for CLC of methane. From all the trimetallic oxygen carriers with different atomic ratios of Cu, Fe, and Mn, CuFeMnO<
sub>
4<
/sub>
, CuFeMn<
sub>
2<
/sub>
O<
sub>
4<
/sub>
, and CuFe<
sub>
0.5<
/sub>
Mn<
sub>
1.5<
/sub>
O<
sub>
4<
/sub>
showed the best performance for CLC of methane. The oxygen carriers CuFeMnO<
sub>
4<
/sub>
, CuFeMn<
sub>
2<
/sub>
O<
sub>
4<
/sub>
, and CuFe<
sub>
0.5<
/sub>
Mn<
sub>
1.5<
/sub>
O<
sub>
4<
/sub>
, even without a support, showed very stable performance during a 100-cycle TGA test. The CuFeMnO<
sub>
4<
/sub>
oxygen carrier also showed excellent performance during a multicycle CLC test with synthesis gas. In conclusion, CuFeMnO<
sub>
4<
/sub>
is also suitable for CLC of a solid fuel, such as carbon, which showed stable performance during a 10-cycle test.