James, Jim, or Jimmy Allen may refer to:

• James Allen (educator) (1683–1746), English educationalist
• James E. Allen Jr. (1911–1971), American education commissioner
• James Vincent Allen (born 1959), Canadian philosopher
• James Peter Allen (born 1945), American Egyptologist

• James C. Allen (engraver) (1790–1833), English engraver
• James Baylis Allen (1803–1876), English line-engraver
• James Lane Allen (1849–1925), American novelist
• James Allen (author) (1864–1912), English poet and motivational writer
• James E. Allen (artist) (1894–1964), American illustrator, printmaker, and painter
• James Latimer Allen (1907–1977), American photographer and portraitist
• Jim Allen (artist) (1922–2023), New Zealand visual artist
• Jim Allen (playwright) (1926–1999), English playwright
• James H. Allen (1928–2015), American children's television actor
• Jimmie Allen (born 1985), American country singer
• Jimmy Allen (musician), American rock musician

• James Mountford Allen (1809–1883), British architect
• James L. Allen (1904–1992), American businessman
• James F. Allen (businessman) (born 1960), American businessman

• James Allen (Virginia politician) (1802–1854), American politician in Virginia
• James C. Allen (1822–1912), U.S. representative from Illinois
• James P. Allen (politician) (1848–1922), American politician in Oklahoma and Mississippi
• James Allen (New Zealand politician) (1855–1942)
• James Allen (Alabama politician) (1912–1978), U.S. senator from Alabama
• Jim L. Allen (1934–2003), American politician in Kansas
• Jim Allen (Wyoming politician) (born 1952), American politician in Wyoming

• James Allen (Army engineer) (1806–1846), American army officer
• James Allen (Medal of Honor) (1843–1913), Irish-born American soldier
• James R. Allen (1925–1992), American air force general
• James Allen da Luz (1938–1973), Brazilian guerrilla

• James Allen (priest, born 1802) (1802–1897), English Anglican clergyman
• James Allen (priest, born 1805) (1805–1880), Irish Anglican priest
• Jimmy Allen (pastor) (1927–2019), American Southern Baptist pastor
• James B. Allen (historian) (1927–2024), American Mormon historian

• James Allen (nurseryman) (1830–1906), English horticulturalist
• James Van Allen (1914–2006), American space scientist
• Jim Allen (archaeologist) (1938–2025), Australian archaeologist
• James F. Allen (computer scientist) (born 1950), American computational linguist

• Jimmy Allen (American football) (1952–2019), American football player
• James Allen (running back) (born 1975), American football running back
• James Allen (linebacker) (born 1979), American football linebacker

• James Allen (cricketer) (1881–1958), English cricketer
• Jimmy Allen (footballer, born 1909) (1909–1995), English footballer
• Jim Allen (footballer) (1912–1972), Australian rules footballer
• Jimmy Allen (footballer, born 1913) (1913–1979), English footballer
• Jim Allen (hurdler) (born 1941), American track and field athlete
• Jim Allen (cricketer) (born 1951), Montserratian cricketer
• James Allen (journalist) (born 1966), British motor sports journalist
• Jimmy Allen (basketball) (born 1971), American basketball coach
• James Allen (racing driver) (born 1996), Australian racing driver

• James Allen (newspaperman) (1806–1886), English-born journalist in Australia and New Zealand
• James Allen (highwayman) (1809–1837), American criminal
• James S. Allen (1906–1986), American Communist activist
• James Allen (collector) (born 1954), American antique collector

• James Allen's Girls' School, a private school in Dulwich, South London, England

• James Allan (disambiguation)
• Allen (surname)