Computing devices and microphone assemblies including acoustic waveguides are described. According to some examples, a computing device may include an enclosure, a microphone which may be spaced apart and angled relative to the interior surface of the enclosure to which the microphone may be coupled. The computing device may further include an acoustic waveguide disposed between the microphone and the interior surface of the enclosure, the acoustic waveguide having a passage for allowing acoustic energy to be transmitted from a microphone opening in the enclosure to the receiving element of the microphone (also referred to as sensing element, or microphone sensor).