Bažant was elected to US National Academy of Sciences in 2002, US National Academy of Engineering in 1996, and American Academy of Arts and Sciences in 2008. He is a foreign member of the Royal Society of London (2015), Austrian Academy of Sciences, Academy of Engrg. of Czech Rep., Italian National Academy (dei Lincei, Rome), Spanish Royal Academy of Engineering, Academy of Athens, First Section (2017), Indian National Academy of Engineering, Istituto Lombardo, Milan (2002), Academia Europaea (London) (2014), and European Academy of Science and Arts. His honors include 7 honorary doctorates: CTU Prague (1991), TU Karlsruhe (Fredericiana, 1997), UC Boulder (2000), Politecnico di Milano (2001), INSA Lyon (2004), TU Vienna (2006), and Ohio State University Columbus (2011). He is an honorary member of Am. Soc. of Mechanical Engineers (ASME), Am. Soc. of Civil Engineers (ASCE), Am. Concrete Institute (ACI), RILEM, Paris (Int. Union of Res. Lab. In Mat. & Str.), Czech Soc. of Mechanics, Czech Soc. of Civil Engineers, Czech Concrete Society, and Building Res. Institute of Spain. His honors include: