Ilmar is an Estonian masculine given name^[1] and may refer to:

• Ilmar Aluvee (1969–2013), Estonian skier
• Ilmar Kullam (1922–2011), Estonian basketball player and Olympic athlete
• Ilmar Laaban (1921–2000), Estonian poet and publicist
• Ilmar Ojase (born 1973), Estonian swimmer
• Ilmar Öpik (1917–2001), Estonian energetics scientist and academician
• Ilmar Raag (born 1968), Estonian media executive, screenwriter and film director
• Ilmar Raud (1913–1941), Estonian chess master
• Ilmar Reepalu (born 1943), Estonian-born Swedish politician
• Ilmar Sikemäe (1914–1998), Estonian writer
• Ilmar Tamm (born 1972), Estonian Brigadier General
• Ilmar Taska (born 1953), Estonian filmmaker and writer

• Ilmari, a similar, Finnish masculine given name
• Ilmārs, a similar, Latvian masculine given name