Taijutsu is a form of basic techniques, which revolve around the usage of hand to hand combat instead of Ninjutsu or Genjutsu. Usually every Shinobi is half decent at Taijutsu, however, there are some who excel at using this form of combat. Here are the strongest Taijutsu users known in Naruto:
Hinata was not really good at hand to hand combat at first, often losing to her little sister. However, she was later trained by Neji. Her combat prowess increased a lot and by the time of the 4th Great Ninja War, she could even perform 64 Palms technique.
Kimimaro was a member of the Kaguya Clan. He used his Kekkei Genkai of Shikotsumyaku as a part of his Taijutsu. This made him very strong, and gave him a defense that was very hard to penetrate.
Neji was the genius of the Hyuga Clan. He possessed amazing skills and could use the Byakugan perfectly even at a young age. He had basically mastered almost all of the Byakugan by the time he became a Jonin.