Otto Hoynck (1630 – after 1706) was a Dutch Golden Age portrait painter active in England.
According to the RKD he was born and trained in The Hague as a pupil of Arnold van Ravesteyn and Pieter Hermansz Verelst (Verelst became his brother-in-law). He moved to England after being registered in Amsterdam in 1686. Jacob Campo Weyerman listed him as Otto Hoijink.