No, white blood cells (or leukocytes) aren’t involved in blood clotting. Instead, they help to protect the body from infection and disease. There are five major types of leukocytes, each with their own characteristics. In order of abundance in our body, these types are neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Multiple types of lymphocytes exist.
White blood cells protect us by a variety of methods. For example, some surround and ingest invading microbes or cellular debris. Others produce proteins called antibodies. Some release other helpful chemicals or activate other leukocytes. The cells play a vital role in our body, even though they don't help blood to clot.