HMS Sirius was a wooden steamship of the Royal Navy, launched in 1850. Designed for both naval and commercial use, she was equipped with a single screw propeller and a steam engine, allowing her to operate effectively in various conditions. The ship served primarily in the Australian waters, where she played a significant role in maritime operations. HMS Sirius was notable for her involvement in the Crimean War, supporting British forces and demonstrating the transition from sail to steam power in naval warfare.