Galen

• Galen Bodenhausen (born 1961), American social psychologist
• Galen A. Carter (1832–1893), American politician
• Galen Cisco (born 1936), American former Major League Baseball pitcher
• Galen Clark (1814–1910), first European American to discover the Mariposa Grove of Giant Sequoia trees and conservationist
• Galen Cole (1925–2020), American philanthropist
• Galen Cranz, American professor of architecture
• Galen Dreibelbis (born 1935), American politician
• Galen Gering (born 1971), American actor
• Galen Hadley (born 1942), American politician
• Galen Hall (born 1940), American retired college and professional football coach and player
• Galen Higdon (born 1954), American politician
• Galen Hollenbaugh (fl. 2006–present), American politician
• Galen Laack (1931–1958), American football player
• Galen Rowell (1940–2002), American wilderness photographer, adventure photojournalist and climber
• Galen Rupp (born 1986), American long-distance runner
• Galen Seaman (1837–1932), American lawyer and politician
• Galen L. Stone (1862–1926), American financier and philanthropist
• Galen L. Stone (diplomat) (1921–2018), American diplomat, Ambassador to Cyprus, grandson of the above
• Galen Stone (American football) (born 1988), American former football player
• Galen Strawson (born 1952), British analytic philosopher and literary critic
• Galen D. Stucky, American chemist
• Galen Weston (1940–2021), British-Canadian billionaire businessman and philanthropist
• Galen Weston Jr. (born 1972), Canadian billionaire businessman, son of the above

Galyn

• Galyn Görg (American actress)
• Galyn Susman

Gaelan

• Gaelan Connell (American actor and director)

Gaelyn/Gaelynn/Gaelynne

• Gaelynn Lea (American disability advocate and violinist)
• Gaelyn Gordon (New Zealand writer)

Gaelen

• Gaelen Foley (American author)
• Gaelen Gilliland (American actress who works in musical theaters)

Gaylyn/Gaylyne

• Gaylyne Ayugi (Kenyan model)

• Gaylyn Studlar (American critic and professor)

Gaylen/Gaylene

• Gaylen Byker (American businessman)
• Gaylene Sciascia (New Zealand dance educator)
• Gaylene Preston (New Zealand filmmaker)
• Gaylen Ross (American actress)
• Gaylen Pitts (American baseball coach, manager and player)
• Gaylen C. Hansen (American artist)