No the far lest a probe as landed was Saturn
The Voyager I and the Voyager II are the only space probes to visit Neptune. They landed in the 1980s.
The answer depends on "before what".
probes
Semi-autonomous space probes have gone to the vicinity of Neptune, but no robots in the popular sense.
No spacecraft from Earth has ever landed on Neptune.
You cant land on a gas giant But probes have gone "inside" gas giants
nowone has ever traveled to Neptune only probes
yes lots of space probes
USA
No - there is no surface to land on.
the mars rover
Huygens