| Ruth Holzhausen | |
| Fullname: | Ruth Holzhausen-Malkus |
| Nationality: | German |
| Birth Date: | 29 September 1959 |
| Birth Place: | Berlin, Germany |
| Height: | 179 cm |
Ruth Holzhausen (born September 29, 1959) is a retired female volleyball player from Germany, who competed for West Germany at the 1984 Summer Olympics in Los Angeles, United States. There finished sixth with the national squad after a 3-0 loss in the fifth place playoff against South Korea. She is the mother of German long-jumper Lena Malkus.