Adelaide of Cleves (died 1238), also known as Aleid and Adelheid was, by her marriage to Dirk VII, Countess of Holland.

She played an important role in the administration during the reign of her husband, during which she served as regent in 1195, and facilitated the marriage and accession of their daughter Ada amid dynastic disputes in 1203.

It is possible that Dirk wanted to prepare his subjects for a possible regency of Adelaide, in case he died young.

A regency of Adelaide for her daughter could meet with resistance because it was nowhere stipulated that a woman could succeed in the county of Holland.

Her arrival was, moreover, "to the great disadvantage of the monastery and to the inconvenience of the whole monastic community, because the Church had to pay her expenses for food as well as for many other things, for the benefit of the knights and the others".

In an attempt to secure the succession, Adelaide hastily arranged a marriage between her only surviving daughter Ada and Louis II, Count of Loon.

According to the annalist, Adelaide would also play an active role in this: "…everything was handled according to the will, orders and directions of Countess Aleid".

Ada was captured after taking refuge in the stronghold of Leiden, and was then sent to William's ally John Lackland in London.

There is, however, a letter from Adelaide from 1207 to King John of England, in which she begs him to let her daughter Ada, who is being held captive there by order of William, return to Holland.

The Count's family apparently held no grudge against Adelaide, because after her death around 1238 (an exact year or date is unknown) she was indeed buried in Rijnsburg.