James Allen
James, Jim, or Jimmy Allen may refer to:
Academics
- James Allen (educator) (1683–1746), English educationalist
 - James F. Allen (computer scientist) (born 1950), professor of computer science
 - James Peter Allen (born 1945), Egyptologist
 - James Van Allen (1914–2006), space scientist
 - James Vincent Allen (born 1959), Canadian philosopher
 - Jim Allen (archaeologist), Australian archaeologist
 
Military
- James Allen (Army engineer) (1806–1846), organizer of the Mormon Battalion, helped found Des Moines, Iowa, and helped design the Chicago harbor
 - James Allen (Medal of Honor) (1843–1913), Medal of Honor recipient during the American Civil War
 - James R. Allen (1925–1992), superintendent of the U.S. Air Force Academy
 
Politics
- James Allen (New Zealand politician) (1855–1942), cabinet minister
 - James Allen (Virginia politician) (1802–1854), member of the Virginia House of Delegates
 - James Allen (Alabama politician) (1912–1978), U.S. senator from Alabama
 - James C. Allen (1822–1912), U.S. representative from Illinois
 - James E. Allen Jr. (1911–1971), commissioner of education for New York State
 - James P. Allen (politician) (1848–1922), American politician, mayor of Oklahoma City and a Mississippi state senator
 - Jim Allen (Wyoming politician) (born 1952), member of the Wyoming House of Representatives
 - Jim L. Allen (1934–2003), member of the Kansas state legislature
 
Sports
- James Allen (cricketer) (1881–1958), English cricketer
 - James Allen (journalist) (born 1966), who has worked in, and commentated on, Formula One
 - James Allen (linebacker) (born 1979), American football linebacker
 - James Allen (running back) (born 1975), American football running back
 - James Allen (racing driver) (born 1996), Australian racing driver
 - Jim Allen (cricketer) (born 1951), Montserratian cricketer
 - Jim Allen (footballer) (1912–1972), Australian rules footballer
 - Jim Allen (hurdler) (born 1941), American track and field athlete
 - Jimmy Allen (footballer, born 1909) (1909–1995), Portsmouth, Aston Villa and England footballer
 - Jimmy Allen (footballer, born 1913) (1913–1979), Queens Park Rangers footballer
 - Jimmy Allen (American football) (1952–2019), American football player
 - Jimmy Allen (basketball) (born 1971), American college basketball coach
 
Writers
- James Allen (newspaperman) (1806–1886), English-born writing in colonial Australia and New Zealand
 - James Allen (author) (1864–1912), philosophical writer from England
 - James Allen (collector) (born 1954), antique collector, co-author of Without Sanctuary: Lynching Photography in America
 - James B. Allen (historian) (1927–2024), historian of The Church of Jesus Christ of Latter-day Saints
 - James Lane Allen (1849–1925), American writer
 - James S. Allen (1906–1986), American Communist historian and journalist
 - Jim Allen (Atlantis hypothesis), British author of the hypothesis that the lost land of Atlantis is South America
 - Jim Allen (playwright) (1926–1999), English playwright
 - James Allen, cartoonist who wrote and illustrated Mark Trail from 2014 to 2020
 
Other
- James Allen (died 1829), female husband
 - James Allen (highwayman) (1809–1837), Massachusetts criminal and memoirist
 - James Allen (nurseryman) (1830–1906), British nurseryman
 - James Allen (priest, born 1802) (1802–1897), Anglican dean of St David's, 1878–1895
 - James Allen (priest, born 1805) (1805–1880), Irish Anglican priest, dean of Killaloe
 - James Allen da Luz (1938–1973), Brazilian guerrilla
 - James Baylis Allen (1803–1876), English line-engraver
 - James C. Allen (engraver) (1790–1833), English engraver
 - James E. Allen (artist) (1894–1964), American illustrator, printmaker, and painter
 - James F. Allen (businessman) (born 1960), with Hard Rock International and Seminole Gaming
 - James H. Allen (1928–2015), actor who played clown "Rusty Nails", inspired "Krusty the Clown"
 - James L. Allen (1904–1992), co-founder of Booz Allen Hamilton; with PricewaterhouseCoopers
 - James Latimer Allen (1907–1977), photographer and portraitist
 - James Mountford Allen (1809–1883), British architect
 - Jim Allen (artist) (1922–2023), New Zealand visual artist
 - Jimmy Allen (musician), member of American rock band Puddle of Mudd
 - Jimmy Allen (pastor) (1927–2019), American Southern Baptist pastor
 - Jimmie Allen (born 1985), American country singer
 - James Allen, jewelry retailer owned by Signet Jewelers
 - James Allen, protagonist in the 1932 film, I Am a Fugitive from a Chain Gang
 - James Allen's Girls' School, a private school in Dulwich, South London, England