Background and Objectives: Management of cardiovascular disease (CVD) during pregnancy is challenging and usually requires eminence-based decisions due to limited strong-evidence data in this field. The purpose of our study was to compare the attitudes of anaesthesiologists, cardiologists, and gynaecologists towards the diagnosis and treatment of potentially life-threatening CVDs during pregnancy. Materials and Methods: A cross-sectional, questionnaire-based study was performed among 111 doctors (55 anaesthesiologists, 36 cardiologists, 20 gynaecologists). Personal opinions on the recommendations (n = 19) regarding rare, potentially life-threatening CVDs during pregnancy were recorded using a five-item Likert scale. Results: Opinions regarding eight statements (42%) varied substantially between specialties (p < 0.05). The most distinctive differences between physicians concerned the following recommendations: “thrombolysis should only be used in pulmonary embolism with cardiogenic shock” (agree: 52.7% of anaesthesiologists, 80.4% of cardiologists, 25.0% of gynaecologists; p < 0.001); “women with the antiphospholipid syndrome should restart treatment with vitamin K antagonists from the second trimester of pregnancy” (agree: 12.7% of anaesthesiologists, 69.4% of cardiologists, 20.0% of gynaecologists; p < 0.001); “women with symptomatic pulmonary hypertension should have a Swan–Ganz catheter inserted for labour” (agree: 20.0% of anaesthesiologists, 11.1% of cardiologists, 55.0% of gynaecologists; p = 0.001). Conclusions: Physicians’ opinions regarding diagnostics and treatment of CVDs in pregnancy remain controversial. A multidisciplinary approach is recommended to ensure the safety and effectiveness of management in these unique medical conditions.