Translations:Cardiology/97/en
- Robert Atkins (1930–2003), known for the Atkins diet
- Eugene Braunwald (born 1929), editor of Braunwald's Heart Disease and 1000+ publications
- Wallace Brigden (1916–2008), identified cardiomyopathy
- Manoj Durairaj (1971– ), cardiologist from Pune, India who received Pro Ecclesia et Pontifice
- Willem Einthoven (1860–1927), a physiologist who built the first practical ECG and won the 1924 Nobel Prize in Physiology or Medicine ("for the discovery of the mechanism of the electrocardiogram")
- Werner Forssmann (1904–1979), who infamously performed the first human catheterization on himself that led to him being let go from Berliner Charité Hospital, quitting cardiology as a speciality, and then winning the 1956 Nobel Prize in Physiology or Medicine ("for their discoveries concerning heart catheterization and pathological changes in the circulatory system")
- Andreas Gruentzig (1939–1985), first developed balloon angioplasty
- William Harvey (1578–1657), wrote Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus that first described the closed circulatory system and whom Forssmann described as founding cardiology in his Nobel lecture
- Murray S. Hoffman (1924–2018) As president of the Colorado Heart Association, he initiated one of the first jogging programs promoting cardiac health
- Max Holzmann (1899–1994), co-founder of the Swiss Society of Cardiology, president from 1952 to 1955
- Samuel A. Levine (1891–1966), recognized the sign known as Levine's sign as well as the current grading of the intensity of heart murmurs, known as the Levine scale
- Henry Joseph Llewellyn "Barney" Marriott (1917–2007), ECG interpretation and Practical Electrocardiography
- Bernard Lown (1921–2021), original developer of the defibrillator
- Woldemar Mobitz (1889–1951), described and classified the two types of second-degree atrioventricular block often called "Mobitz Type I" and "Mobitz Type II"
- Jacqueline Noonan (1928–2020), discoverer of Noonan syndrome that is the top syndromic cause of congenital heart disease
- John Parkinson (1885–1976), known for Wolff–Parkinson–White syndrome
- Helen B. Taussig (1898–1986), founder of pediatric cardiology and extensively worked on blue baby syndrome
- Paul Dudley White (1886–1973), known for Wolff–Parkinson–White syndrome
- Fredrick Arthur Willius (1888–1972), founder of the cardiology department at the Mayo Clinic and an early pioneer of electrocardiography
- Louis Wolff (1898–1972), known for Wolff–Parkinson–White syndrome
- Karel Frederik Wenckebach (1864–1940), first described what is now called type I second-degree atrioventricular block in 1898