Lodewijk Count van Bylandt (, 1718 – Hoeven, 28 December 1793) was a Dutch lieutenant-admiral. He gained a certain notoriety in the Affair of Fielding and Bylandt of 1779 and even more in consequence of the refusal of the Dutch navy to put out to sea to combine with the French fleet in Brest in 1783, during the Fourth Anglo-Dutch War, for which refusal many held him responsible. He was court-martialed and exonerated in the first case, and in the second case an inquiry into his conduct was long delayed and eventually quietly abandoned after stadtholder William V had prevailed against the Patriottentijd in 1787. This made his promotion to lieutenant-admiral (the highest rank in the Dutch navy, as that of General Admiral could only be held by the stadtholder) possible. He died in office as inspector-general and commander of the gunners corps of the navy of the Dutch Republic.
Van Bylandt was the son of Ludwig Roeleman, Imperial Count of Bylandt-Halt (a cadet branch of the House of Bylandt), a Prussian high official, and Christina Maria Louisa Freiin (baroness) von Heyden - Broeck. He never married. He was a relative of several other high officers in the army and navy of the Dutch Republic and Kingdom of the Netherlands, among whom Willem Frederik van Bylandt, who commanded a brigade at the Battle of Waterloo.
Van Bylandt entered the Dutch navy as an adelborst (midshipman) in 1736 in which year he sailed on a cruise to Curaçao. He attained the rank of captain in 1747. In 1756 he was captain of West Stellingwerff and in 1768 of Thetis with which he took part in expeditions against the Barbary corsairs in those years. In 1775 Van Bylandt was acting-commander of a Dutch naval expedition (with the rank of rear-admiral) against Morocco. This expedition was successful in its object to force Sultan Mohammed ben Abdallah to sue for peace.