Yes - oily skin will still benefit from a Hyaluronic Acid serum. Hyaluronic Acid is beneficial for a wide array of skin types including oily skin. A common misconception is that oily skin does not need additional hydration, however, the opposite is true. Depriving your skin of moisture may cause it to overcompensate and produce even more oil. It is key to note that oily skin is characterised by an excess presence of sebum, and not necessarily an abundance of moisture. Dehydrated skin can result in premature ageing, therefore, it is crucial to ensure that your skin is receiving an ample amount of hydration.
When hydrating oily skin, look for oil free, non-comedogenic formulas to help retain moistures and ingredients that are lightweight but effective. Hyaluronic Acid also contains the ability to retain up to 1000x its weight in water, offering lightweight hydration that will not feel heavy on oily skin. Featured in SkinCeuticals 
Hydrating B5, this lightweight moisturising agent has a unique ability to attract and retain moisture in skin, effectively delivering long-lasting hydration without clogging pores.