Nine ships of the Royal Navy have borne the name HMS Investigator. Another was planned, but renamed before being launched. The name Investigator passed on to the Royal Indian Navy and after India's Independence, to its successor the Indian Navy where the lineage of naming survey ships Investigator continues unbroken.
HMS Investigator was a 22-gun armed ship purchased in 1798 and taken into service as HMS Xenophon. She was renamed HMS Investigator in 1801 and used as a survey ship. Under the command of explorer Matthew Flinders, she was the first ship to circumnavigate Australia. She was broken up in 1810.
HMS Investigator was a 16-gun survey brig launched in 1811. She was used as a police ship from 1837 and was broken up in 1857.
HMS Investigator was a survey sloop purchased in 1823. Her fate is unknown.
HMS Investigator was a discovery vessel purchased in 1848 to search for Sir John Franklin's lost expedition, and abandoned in the Arctic in 1853.
HMS Investigator was a wooden paddle survey vessel launched in 1861 and sold in 1869.
HMS Investigator was a wooden paddle survey vessel launched in 1881 and sold in 1906.
HMS Investigator was to have been a paddle survey vessel. She was renamed HMS Research in 1887, before being launched in 1888.
HMS Investigator was a survey vessel purchased in 1903. She was renamed HMS Sealark in 1904 and was sold in mercantile service in 1919.
HMS Investigator was a survey vessel launched in 1907 and sold in 1934.
HMIS Investigator was a survey vessel of the Royal Indian Navy and later the Indian Navy purchased in 1932 and sold in 1951.
