Pratap Singh Shah, King of Nepal (Nepali: प्रतापसिंह शाह) (1751–1777) was the second King of Nepal. He was the eldest son of Prithvi Narayan Shah, the king who first unified Nepal.
He became King at the age of 24 in 1775. Pratap Singha Shah rules only up to 1777 for 36 months and died of natural causes at the age of 26. He was succeeded by his two-year-old son Rana Bahadur Shah. He did not actively participate in the unification campaign led by his father, and the boundaries of Nepal kept extending as his brother Prince Bahadur Shah continued the unification campaign during his reign. He was more involved in the Royal luxuries rather than the unification campaign.