BLISS is a system programming language developed at Carnegie Mellon University by W. A. Wulf, D. B. Russell, and A. N. Habermann around 1970. It was perhaps the best known systems programming language right up until C made its debut a few years later. Since then, C took off and BLISS faded into obscurity. When C was in its infancy, a few projects within Bell Labs were debating the merits of BLISS vs. C.

Bliss may refer to:

• Aaron T. Bliss (1837–1906), U.S. Representative and Governor of Michigan
• A. J. Bliss (1862–1931), British iris breeder
• Arthur Bliss (1891–1975), British composer
• Atlanta Bliss, American jazz musician who specializes in the trumpet
• Baron Bliss (Henry Edward Ernest Victor Bliss, 1869–1926), traveller
• Bliss Carman (1861–1929), Canadian poet
• Brian Bliss (born 1965), retired American soccer defender and former coach of the Kansas City Wizards of Major League Soccer
• C. D. Bliss (1870–1948), American football player and coach in the United States
• Caroline Bliss (born 1961), British actress
• Charles K. Bliss (1897–1985), inventor of Blissymbols
• Chester Ittner Bliss (1899–1979), biologist known for his contributions to statistics.
• Cornelius Newton Bliss (1833–1911), US merchant and politician
• Daniel Bliss (1823–1916), founder of AUB, the American University of Beirut
• Dave Bliss (born 1943), former American college basketball coach
• Diana Bliss (1954–2012), Australian theatre producer, second wife of Alan Bond
• Douglas Bliss (1900–1984), Scottish painter
• Duane Leroy Bliss (1835–1910), American industrialist
• Ed Bliss (1912-2002), American journalist
• Edward Bliss (1865-1960), American missionary to China
• Eleanor Albert Bliss (1899–1987), American bacteriologist
• Frank Bliss (1852-1929), American baseball player
• Franklyn Bliss Snyder (1884-1958), American educator and academic
• Frederick J. Bliss (1857–1939), American archaeologist
• George Bliss (Congressman) (1813–1868), US Congressman
• Gilbert Ames Bliss (1876–1951), American mathematician
• Harry Bliss, American cartoonist
• Henry E. Bliss (1870–1955), American librarian and inventor of the Bliss classification
• Henry H. Bliss (1830–1899), first person killed in a motor vehicle accident in the United States
• Johnny Bliss (1922–1974), Australian rugby league footballer
• Ian Bliss, Australian actor
• Laurie Bliss (1872–1942), American football player and coach in the United States
• Lillie P. Bliss (1864–1931), American art collector and patron, founder of Metropolitan Museum of Art
• Lucille Bliss (born 1916), American actress and voice artist
• Michael Bliss (born 1941), Canadian historian and award-winning author
• Mike Bliss (born 1965), American NASCAR driver
• Nathaniel Bliss (1700–1764), English astronomer
• Philemon Bliss (1813–1889),US Congressman and jurist
• Philip Bliss (1838–1876), American hymn lyricist and composer
• Philip Bliss (academic) (1787–1857), Registrar of the University of Oxford, etc.
• Ray C. Bliss (1907–1981), one of the important national U.S
• Raymond W. Bliss (1888–1965), Surgeon General of the U.S. Army 1947–1951
• Richard Bliss, American telecommunications technician arrested in Russia on charges of espionage.
• Ryan Bliss (born 1971), US digital artist
• Sister Bliss (born 1970), British keyboardist, record producer, DJ, composer and songwriter
• Stephen Bliss (1787–1847), American minister and politician
• Sylvester Bliss (1814–1863), Millerite minister and editor
• Timothy Vivian Pelham Bliss (born 1940), British neuroscientist
• Thomas Bliss (born 1952), motion picture producer and executive producer
• Tasker H. Bliss (1853–1930), U.S. Army officer
• Willard Bliss (1825-1889), American doctor
• William Dwight Porter Bliss (1856–1926), American religious leader and activist
• William Henry Bliss (1835–1911), English scholar
• William Wallace Smith Bliss (1815–1853), U.S. Army Officer
• Zenas Bliss (1835–1900), U.S. Army General and Medal of Honor recipient