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Karl Wilhelm Bücher (16 February 1847, Kirberg, Hesse – 12 November 1930, Leipzig, Saxony) was a German economist, one of the founders of non-market economics, and the founder of journalism as an academic discipline.

Victor Charles Louis Brochard (French: [bʁɔʃaʁ]; 29 June 1848 – 25 November 1907) was a French philosopher and historian of philosophy.

Louis Marcel Brillouin (French pronunciation: [lwi maʁsɛl bʁijwɛ̃]; 19 December 1854 – 16 June 1948) was a French physicist and mathematician.
Born in Saint-Martin-lès-Melle, Deux-Sèvres, France, his father was a painter who moved to Paris when Marcel was a boy. There he attended the Lycée Condorcet. The Brillouin family returned to Saint-Martin-lès-Melle during the Franco-Prussian War of 1870 to escape the fighting. There he spent time teaching himself from his grandfather's philosophy books. After the war, he returned to Paris and entered the École Normale Supérieure in 1874 and graduated in 1878. He became a physics assistant to Éleuthère Mascart (his future father-in-law) at the Collège de France, while at the same time working for his doctorates in mathematics and physics, which he gained in 1880 and 1882, respectively. Brillouin then held successive posts as assistant professor of physics at universities in Nancy, Dijon and Toulouse before returning to the École Normale Supérieure in Paris in 1888. Later, he was Professor of Mathematical Physics at the Collège de France from 1900 to retirement in 1931.
In 1911 he was one of only six French physicists invited to the first Solvay Conference. He was awarded the Prix La Caze for 1912.
Brillouin was elected to the Académie des Sciences in 1921. He was an officer of the Legion of Honour.During his career he was the author of over 200 experimental and theoretic papers on a wide range of topics which include the kinetic theory of gases, viscosity, thermodynamics, electricity, and the physics of melting conditions. Most notably he:

built a new model of the Eötvös balance,
wrote on Helmholtz flow and the stability of aircraft,
worked on a theory of the tides.Brillouin died in Paris (16 June 1948). His son Léon Brillouin, also had a prominent career in physics.

Henri-Alexis Brialmont (Venlo, 25 May 1821 – Brussels, 21 July 1903), nicknamed The Belgian Vauban after the French military architect, was a Belgian army officer, politician and writer of the 19th century, best known as a military architect and designer of fortifications. Brialmont qualified as an officer in the Belgian army engineers in 1843 and quickly rose up the ranks. He served as a staff officer, and later was given command of the district of the key port of Antwerp. He finished his careers as Inspector-General of the Army. Brialmont was also an active pamphleteer and political campaigner and lobbied through his career for reform and expansion of the Belgian military and was also involved in the foundation of the Congo Free State.
Today, Brialmont is best known for the fortifications which he designed in Belgium and Romania and would influence another in the Democratic Republic of the Congo. The fortifications he designed in Belgium at the end of the 1880s around the towns of Liège, Namur and Antwerp would play an important role during the early stages of the German invasion of Belgium during World War I.

Louis François Clément Breguet (22 December 1804 – 27 October 1883), was a French physicist and watchmaker, noted for his work in the early days of telegraphy.
Educated in Switzerland, Breguet was the grandson of Abraham-Louis Breguet, founder of the watch manufacturing company Breguet. He became manager of Breguet et Fils watchmakers in 1833 after his father Louis Antoine Breguet retired.
Between 1835 and 1840 he standardized the company product line of watches, then making 350 watches per year, and diversified into scientific instruments, electrical devices, recording instruments, an electric thermometer, telegraph instruments and electrically synchronized clocks. With Alphonse Foy, in 1842 he developed the Foy-Breguet telegraph, an electrical needle telegraph to replace the optical telegraph system then in use. and a later step-by-step telegraph system (1847) was applied to French railways and exported to Japan. He observed in 1847 that small wires could be used to protect telegraph installations from lightning, the ancestor of the fuse.
In 1850 he manufactured a rotating mirror used by Hippolyte Fizeau to measure the relative speed of light in air and water.: 129  In 1856 he designed a public network of synchronized electric clocks for the center of Lyon. In 1866 he patented an electric clock controlled by a 100 Hz tuning fork.In 1870 he transferred the leadership of the company to Edward Brown. Breguet then focused entirely on the telegraph and the nascent field of telecommunications. He collaborated in the development of an induction coil, later improved by Heinrich Ruhmkorff.
In terms of honors, in 1843 he was appointed to the Bureau of Longitudes. In 1845 Breguet was awarded the Legion d'Honneur. He was made a member of the French Academy of Sciences in 1874, and was elevated to Officer of the Legion d'Honneur in 1877. He is one of the 72 French scientists whose names are written around the base of the Eiffel Tower.Breguet was married and had one son Antoine (1851–1882) who also joined the family electrical business. With his son, he met Alexander Graham Bell and obtained a license to manufacture Bell telephones for the French market. He was the grandfather of Louis Charles Breguet and the uncle of Sophie Berthelot.

Marcello Boldrini (9 February 1890, in Matelica – 5 March 1969, in Milan) was an Italian statistician.

Louis Florimond Joseph Blaringhem (1 February 1878 in Locon – 1 January 1958 in Paris) was a French agronomist and botanist.

Raphaël Anatole Émile Blanchard (28 February 1857 – 7 February 1919) was a French physician and naturalist who was a pioneer of medical zoology, with studies on parasites ranging from protozoa to worms and insects.

Blanchard was born in Saint-Christophe-sur-le-Nais. He was a great grand nephew of the balloonist and parachute inventor Jean Pierre Blanchard. He went to study medicine in Paris in 1874. He became interested in zoology and worked at the laboratory at the École des Hautes-Études where he became a histological preparator for Charles Robin and Georges Pouchet, the latter influencing him towards studies on experimental teratology (inducing mutations and malformations). He travelled around Europe in 1877 with a grant from the Paris City Council, studying embryology in Vienna and comparative anatomy in Bonn. He received another grant in 1880 to study the organization of universities and biological education across Europe. He wrote a dissertation on anesthesia induced by nitrous oxide in 1880 under Paul Bert and received a medical degree. He became a professor of natural history at the faculty of medicine in Paris in 1883. In 1884 he also became a professor in the school of anthropology. He taught medical zoology from 1883 to 1887. He became interested in microbiology after studies at the Institut Pasteur in 1896 and took an interest in parasitology. He founded the journal Archives de parasitologie in 1898.In 1889 he served as the secretary general for the 1st International Congress of Zoology in Paris alongside the Universal Exhibition. He was made officer of the Legion of Honor in 1912. Towards the end of his life he studied medical works from the Middle Ages including stone inscriptions.

Ludwig Georg Elias Moses Bieberbach (German: [ˈbiːbɐˌbaχ]; 4 December 1886 – 1 September 1982) was a German mathematician and Nazi.

Gabriel Bertrand (born 17 May 1867 in Paris, died 20 June 1962 in Paris) was a French pharmacologist, biochemist and bacteriologist.
Bertrand introduced into biochemistry both the term “oxidase” and the concept of trace elements.
The laccase, a polyphenol oxidase and an enzyme oxidating urishiol and laccol obtained from the lacquer tree, was first studied by Gabriel Bertrand in 1894.Bertrand's rule refers to the fact that the dose–response curve for many micronutrients is non-monotonic, having an initial stage of increasing benefits with increased intake, followed by increasing costs as excesses become toxic. In 2005, Raubenheimer et al. fed excess carbohydrates to Spodoptera littoralis and extended Bertrand's rule to macronutrients.In 1894, with Césaire Phisalix, he developed an antivenom for use against snake bites.Bertrand was made a member of the Académie Nationale de Médecine in 1931. In 1932 he became foreign member of the Royal Netherlands Academy of Arts and Sciences.