Thad is a masculine given name, often a short form (hypocorism) of Thaddeus. It may refer to:

• Thad Allen (born 1949), United States Coast Guard admiral
• Thad Altman (born 1955), American politician
• Thad Balkman (born 1971), American politician, lawyer, and judge
• Thaddeus Thad Bingel, American educator and political consultant
• Thaddis Thad Bosley (born 1956), American baseball player
• Thaddeus Thad F. Brown (1902–1970), American police chief
• Thad Busby (born 1974), American football player
• Thaddeus Thad Carhart (born 1950), American writer
• Thad Castle, character in the TV series Blue Mountain State
• William Thad Cochran (1937–2019), United States Senator from Mississippi
• Thad Cockrell, American singer-songwriter
• Thaddeus Thad A. Eure (1899–1993), American politician
• Thad McIntosh Guyer (born 1950), American lawyer
• Thad Heartfield (1940–2022), American lawyer and federal judge
• Thaddeus Thad Hutcheson (1915–1986), American attorney and politician
• Thad J. Jakubowski (1924–2013), American Roman Catholic bishop
• Thad Jaracz (born 1946), American basketball player
• Thaddeus Thad Jones (1923–1986), American jazz trumpeter and bandleader
• Thad Krasnesky (fl. 2000s–2020s), American children's author
• Thad Levine (born 1971), American baseball executive
• Thaddeus Thad Lewis (born 1987), American football player
• Thaddeus Thad Luckinbill (born 1975), American actor and film producer
• Thad Matta (born 1967), American men's basketball coach
• Thad McArthur (born 1928), American Olympic modern pentathlete
• Thad McClammy (born 1942), American politician
• Thaddus Thad McFadden (American football) (born 1962), American football player
• Thaddus Thad McFadden (basketball) (born 1987), American basketball player
• Thaddeus Thad Moffitt (born 2000), American racing driver
• Thaddeus Thad Mumford (1951–2018), American television writer and producer
• Thaddeus Thad Spencer (1943–2013), American heavyweight boxer
• Thad Starner (fl. 1980s–2010s), American computer scientist
• Thaddeus Thad Stem Jr. (1916–1980), American author and poet
• Thaddeus Stevens (1792–1868), United States Representative from Pennsylvania
• Robert Thaddeus R. Thad Taylor (1925–2006), American theatre director
• Thaddeus Thad Tillotson (1940–2012), American baseball pitcher
• Thad Vann (1907–1982), American football player and coach
• Thad Viers (born 1978), American politician
• Thad Vreeland Jr. (1924–2010), American materials scientist
• Thad Weber (born 1984), American baseball pitcher