- Waksman, Selman Abraham (1888-1973)
- Wasserman Test
- Wastewater Treatment
- Water Pollution and Purification
- Water Quality
- Watson, James D. (1928- )
- Welch, William Henry (1850-1934)
- Weller, Thomas (1915- )
- West Nile Virus
- Wilkins, Maurice Hugh Frederick (1916- )
- Wine Making
- Winogradsky Column
- Wong-Staal, Flossie (1947- )
- Woodward, Robert B. (1917-1979)
- World Health Organization (WHO)
- Wright, Almroth Edward (1861-1947)
