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This paper presents a hybrid beamforming design for millimeter-wave (mmWave) orthogonal frequency division multiplexing (OFDM) distributed antenna systems (DASs).First,we derive a downlink signal transmission model that considers the delay spread differences (DSDs) caused by the distributed nature of the network.We then propose a cooperative wideband hybrid beamforming method under the transmitting power constraints of each remote access unit.In a simulation study,the proposed method performed comparably to fully-digital beamforming,even when operated with practical finite-resolution phase shifters.We further confirm that the DSDs are the dominant cause of performance degradation in mmWave OFDM DASs.