Sir Richard John Strachan, 6th Baronet GCB (27 October 1760 – 3 February 1828) was a British officer of the Royal Navy during the French Revolutionary and Napoleonic Wars, eventually rising to the rank of admiral. Sir Dicky, as his friends referred to him, was the last Chief of Clan Strachan. The Baronetcy became dormant in 1854 as he died without male heir.