Is Prince Charles in Line for the British Throne?

Yes. King Charles III (formerly Prince Charles) has been the monarch since September 8, 2022, upon the death of his mother, Queen Elizabeth II.

Before accession, he was heir apparent for 70 years (longest in British history), holding the titles Prince of Wales, Duke of Cornwall, Duke of Rothesay, etc. His eldest son, Prince William, is now heir apparent and Prince of Wales.