At present, it is a trend in wireless communication to integrate conventional separate components into a single one for further miniaturisation and whole performance optimisation. In this study, a novel filtering Doherty power amplifier topology is proposed, which incorporates a bandpass power divider for power division. The power divider is characterised by third‐order bandpass response and good out‐of‐band performance, and then it can purify the input spectrum for the whole amplifier. For demonstration, an example of this filtering Doherty power amplifier at 2.0 GHz was designed, fabricated and measured. The measured results show that at least 21 dB of the out‐of‐band suppression is obtained up to fourth harmonic for purifying the input spectrum. Meanwhile, high back‐off efficiency is still retained for this filtering Doherty power amplifier.