There are two hormones-
1) ADH (ANTI-DIURETICHORMONE): It is released by hypothalamus. It acts on DCT and CT of nephron and stimulates it to retain the water inside the body hence prevent the loss of excess water through the kidney. It avoids diabetes insipidus. It is also called vasopressin because it increases B.P. in kidney and facilitates ultrafiltration.
2) ALDOSTERONE: It is a mineralocorticoid released from adrenal cortex. Its main role is retention of Na+ ions in the body and it also help in retention of water in the body.