yes, or a 3.5mm to 3.5mm audio jack if you use DVI, that is if the monitor has an audio input also.
Be aware;
Some monitors don't allow HDMI to use as their Audio source, some have separate audio connections to use instead, and the Audio form HDMI would be utterly useless.
If you see a 3.5mm audio input, your monitor may not use HDMI as the sound input.