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In this paper, a class of distributed space-time-frequency codes (DSTFCs) is proposed for broadband wireless relay networks. New DSTFCs employ subcarrier grouping and linear constellation precoding at the source node and distributed linear dispersion coding at the relay nodes, which can achieve both full spatial and multipath diversity. We further show that many existing coding constructions, including distributed space-time block coding (DSTBC), distributed space-frequency coding (DSFC), and distributed cyclic delay coding (DCDC), can be the special cases of our proposed DSTFCs. The simulation results are presented to verify the theoretical analysis.