William, Will, Bill, or Billy Holland may refer to:

• William Holland (merchant), English merchant and MP for Dartmouth
• William Holland (politician) (1782–?), Irish-born farmer and politician in Nova Scotia
• William H. Holland (politician) (1841–1907), member of the Fifteenth Texas Legislature
• William Holland, 1st Baron Rotherham (1849–1927), British industrialist and politician

• Will Holland (baseball) (1862–1930), baseball player
• Billy Holland (baseball) (1874–?), pitcher, Negro league career 1894–1908
• Bill Holland (right-handed pitcher) (Elvis William Holland, 1901–1973), pitcher, Negro leagues career 1920–1941
• Bill Holland (left-handed pitcher) (William David Holland, 1915–1997), pitcher, Major League career 1939

• Bill Holland (sprinter) (1874–1930), track and field athlete
• Bill Holland (1907–1984), American racing driver
• Bill Holland (basketball) (1914–2000), American professional basketball player
• Billy Holland (born 1985), Irish rugby union player

• William Holland (diarist) (1746–1819), English diarist
• William Holland (publisher) (1757–1834), British radical, author and publisher
• William Holland (stained glass maker) (1809–1883), British maker of stained glass
• William Jacob Holland (1848–1932), zoologist and paleontologist
• William L. Holland (1907–2008), Institute of Pacific Relations
• Will Holland (born 1980), musician

• Holland (surname)