The London lobsters, Haselrig's Lobsters or just "Lobsters" were the name given to the cavalry unit raised and led by Sir Arthur Haselrig, a Parliamentarian who fought in the English Civil War. The unit derived its name from the regiment being one of very few units raised as cuirassiers, equipped in suits of plate armour reaching from the head to the knee. The regiment had a somewhat chequered career in combat, but was credited with being one of very few Parliamentarian cavalry units able to stand up to the mounted charge of the Cavaliers in the early years of the war.