Arnold Lulls (floruit 1580–1625) was a Flemish goldsmith and jeweller in London. He served the court and made several pieces intended as diplomatic gifts.

He was born in Antwerp, and settled in London before 1585, and became a denizen of England in 1618. Lulls was also involved in importing goods with other members of the family, his brothers Peter Lulls of Hamburg and Hans or Jehan Lulls. In 1597 they complained to Sir Robert Cecil about their cargo on the Griffin which was taken by the Earl of Cumberland and Sir Thomas Garrard.

In May 1607 he and several residents in Billingsgate were exempted from paying a tax or subsidy.

In 1604 he provided jewels to the Spanish ambassador, the Count of Villamediana to give to the ladies in waiting of Anne of Denmark. The Countess of Derby, Elizabeth de Vere received a jewel set with diamonds worth about £230 supplied by Lulls. The ambassador bought most of the jewels in Brussels.

Lulls worked as a partner of John Spilman and William Herrick supplying jewels to the royal family. A bill from February 1605 includes, a rope of oriental pearls and a large round pearl for Anne of Denmark, a chain and St George for Prince Henry, a jewel for Prince Charles, two gold lockets with portraits given by Anne of Denmark to the French ambassador Christophe de Harlay, Count of Beaumont and his wife Anne Rabot.

An account for jewels supplied by Lulls and Spilman to the royal family between August 1604 and March 1607 totals £2,772. Another list of jewels supplied by Lulls and Spilman includes items with the monograms "AR" and "JR" with thistles.

Lulls also made a jewel for Anne of Denmark intended as a gift for Margaret of Austria, Queen of Spain. Charles Howard, 1st Earl of Nottingham, gave this jewel depicting Habsburg emblems of a diamond double eagle and golden fleece to her in Madrid in May 1605.

In May 1605 Lulls was paid £1,550 and Philip Jacobson was paid £980 for jewels set with diamonds and two dozen buttons given to Anne of Denmark at the baptism of Princess Mary.