Hannes is a masculine given name and a diminutive of Johannes or Hannibal.

Hannes may refer to:

• Hannes Alfvén (1908–1995), Swedish chemist and Nobel-prize winner
• Hannes Aigner (born 1989), German slalom canoeist and Olympic medalist
• Hannes Androsch (born 1938), Austrian entrepreneur, consultant, politician and former Austrian Vice Chancellor
• Hannes Anier (born 1993), Estonian footballer
• Hannes Arch (born 1967), Austrian pilot
• Hannes van Asseldonk (born 1992), Dutch racing driver
• Hannes Astok (born 1964), Estonian journalist, radio presenter and politician
• Hannes Bauer (1954–2016), German trombonist and jazz musician
• Hannes Baumann (born 1982), German sailor and Olympic competitor
• Hannes de Boer (1899–1982), Dutch long jumper and Olympic competitor
• Hannes Bok (1914–1964), American artist and writer
• Hannes Brewis (1930–2007), South African rugby player
• Hannes van der Bruggen (born 1993), Belgian footballer
• Hannes Coetzee (born 1944), South African guitarist
• Hannes Van Dahl (born 1990), Swedish drummer (Sabaton)
• Hannes Dotzler (born 1990), German cross country skier
• Hannes Dreyer (born 1985), South African sprinter and Olympic competitor
• Hannes Eder (born 1983), Austrian footballer
• Hannes Franklin (born 1981), South African rugby player
• Hannes Fuchs (born 1972), Austrian badminton player and Olympic competitor
• Hannes Germann (born 1956), Swiss politician
• Hannes Hólmsteinn Gissurarson (born 1953), Icelandic political science professor and commentator
• Hannes Grossmann (born 1982), German drummer (Obscura)
• Hannes Hafstein (1861–1922), Icelandic poet and politician, former Prime Minister of Iceland
• Hannes Halldórsson (born 1984), Icelandic footballer
• Hannes Heer (born 1941), German historian
• Hannes Hegen (1925–2014), German illustrator and caricaturist
• Hannes Holm (born 1962), Swedish director and screenwriter
• Hannes Hopley (born 1981), South African discus thrower and Olympic competitor
• Hannes Hyvönen (born 1975), Finnish ice hockey player
• Hannes Ignatius (1871–1941), Finnish soldier
• Hannes Irmer (born 1988), German footballer
• Hannes Jaenicke (born 1960), German film and television actor
• Hannes Stefánsson (born 1972), Icelandic chess Grandmaster
• Hannes Kaasik (born 1978), Estonian football referee
• Hannes Kaljujärv (born 1957), Estonian actor
• Hannes Keller (1934–2022), Swiss physicist, mathematician, deep diving pioneer, and entrepreneur
• Hannes Kolehmainen (1889–1966), Finnish Finnish long-distance runner and Olympic medalist
• Hannes Koivunen (1911–1990), Finnish boxer and Olympic competitor
• Hannes Lembacher (born 1954), Austrian fencer and Olympic competitor
• Hannes Lindemann (1922–2015), German doctor, navigator and sailor
• Hannes Linßen (born 1949), German football player and manager
• Hannes Lintl (1924–2003), Austrian architect
• Hannes Löhr (1942–2016), German footballer
• Hannes Maasel (born 1951), Estonian politician
• Hannes Manninen (born 1946), Finnish politician
• Hannes Marais (born 1941), South African rugby player
• Hannes Messemer (1924–1991), German film actor
• Hannes Meyer (1889–1954), Swiss architect
• Hannes Nikel (1931–2001), German film editor
• Hannes Peckolt (born 1982), German sailor and Olympic medalist
• Hannes Pétursson (born 1931), Icelandic poet and writer
• Hannes Pichler, (born ????), Italian luger and Olympic competitor
• Hannes Råstam (1956–2012), Swedish journalist and television presenter
• Hannes Reichelt (born 1980), Austrian alpine ski racer and Olympic competitor
• Hannes Reinmayr (born 1969), Austrian footballer and trainer
• Hannes Rossacher (born 1952), Austrian film director and producer
• Hannes Paul Schmid (born 1980), Italian alpine skier and Olympic competitor
• Hannes Schneider (1890–1955), Austrian ski instructor
• Hannes Sigurðsson (born 1983), Icelandic footballer
• Hannes Sköld (1886–1930), Swedish socialist, anti-militarist, poet and linguist
• Hannes Smárason (born 1967), Icelandic businessman
• Hannes Smith (1933–2008), Namibian journalist, editor and publisher
• Hannes Stiller (born 1978), Swedish footballer
• Hannes Strydom (born 1965), South African rugby player
• Hannes Sula (1894–1955), Finnish-Canadian revolutionary and journalist
• Hannes Swoboda (born 1946), Austrian politician
• Hannes Taljaard (born 1971), South African classical music composer
• Hannes Trautloft (1912–1995), German World War II fighter ace
• Hannes Trinkl (born 1968), Austrian alpine skier and Olympic medalist
• Hannes Tretter (born 1951), Austrian lawyer and human rights expert
• Hannes Torpo (1901–1980), Finnish track and field athlete and Olympic competitor
• Hannes Võrno (born 1969), Estonian comedian, politician and fashion designer
• Hannes Wader (born 1942), German singer-songwriter
• Hannes Walter (1952–2004), Estonian war historian
• Hannes Winklbauer (born 1949), Austrian footballer and coach
• Hannes Zehentner (born 1965), German alpine skier and Olympic competitor

• Hannes (Attack on Titan), a character in the manga series Attack on Titan