Ad is a first name. It is common in the Netherlands, where it is almost always short for Adrianus or Adriaan.^[1] In America it can be short for Adolph, Adam, Addison, and others. People with the first name of Ad include:

• Ad Achkar (born 1988), Lebanese photographer and artist
• Ad van der Avoird (born 1943), Dutch chemist
• Ad Bax (born 1956), Dutch-American biophysicist
• Ad de Boer (born 1946), Dutch politician
• Ad Brennan (1887–1962), American baseball pitcher
• Ad Carter (1895–1957), American cartoonist (Ad stands for "August Daniel")
• Ad Dekkers (1938–1974), Dutch artist
• Ad Dekkers (1953–2002), Dutch cyclist
• Ad Donker (1933–2002), Dutch-South African publisher
• Ad Geelhoed (1942–2007), Dutch professor, civil service worker, and Advocate-General
• Ad Gumbert (1868–1925), American baseball pitcher
• Ad Hermes (1929–2002), Dutch politician
• Ad Kaland (1922–1995), Dutch politician
• Ad Abi Karam (born 1937), Lebanese-Australian Catholic bishop
• Ad van Kempen (born 1944), Dutch actor
• Ad Kolnaar (born 1942), Dutch economist
• Ad Konings (born 1956), Dutch ichthyologist
• Ad Koppejan (born 1962), Dutch politician
• Ad Lagendijk (born 1947), Dutch physicist
• Ad Lankford (1882–1967), American baseball pitcher
• Ad van Liempt (born 1949), Dutch journalist
• Ad Liska (1906–1998), American baseball pitcher
• Ad van Luyn (born 1935), Dutch Roman Catholic bishop
• Ad Melkert (born 1956), Dutch politician
• Ad Minoliti (born 1980), Argentinian visual artist
• Ad Moolhuijzen (born 1943), Dutch water polo player
• Ad Neeleman (born 1964), Dutch-British linguist
• Ad Reinhardt (1913–1967), American abstract painter
• Ad Rutschman (born 1931), American football and baseball coach
• Ad Santel (1887–1966), American professional wrestler
• Ad Simonis (1931–2020), Dutch Roman Catholic cardinal
• Ad Sluijter (born 1981), Dutch guitarist
• Ad Snijders (1929–2010), Dutch painter
• Ad van der Steur (1893–1953), Dutch architect
• Ad Stouthamer (1931–2023), Dutch microbiologist
• Ad Swigler (1895–1975), American baseball pitcher
• Ad Tak (born 1953), Dutch bicycle racer
• Ad van Tiggelen (born 1958), Dutch banker and fantasy writer
• Ad Vandenberg (born 1954), Dutch rock guitarist
• Ad Visser (born 1947), Dutch VJ, presenter, writer, and music artist
• Ad Wammes (born 1953), Dutch composer
• Ad Wenke (1898–1961), American football player and justice
• Ad Wijnands (born 1959), Dutch bicycle racer
• Ad Wolgast (1888–1955), American boxer
• Ad Wouters (born 1944), Dutch-Belgian sculptor
• Ad Yale (1870–1948), American baseball player
• Ad Zonderland (1940–2007), Dutch football manager and administrator