Ivan Naumovich Yazev (Russian: Иван Наумович Язев; 28 September 1895 – 18 April 1955) was a Soviet astronomer, geodesist, and professor.

In 1934, he transferred to Poltava Gravimetric Observatory [ru], and participated in an expedition to observe the total solar eclipse on 19 June 1936 in Vengerovo.

For this, he was expelled from the All-Union Communist Party (Bolsheviks), his doctoral dissertation's defense was disapproved, he was fired from his job, and then evicted from his apartment in Novosibirsk.

[1] Arktur (1930–2010) became an astronomer, working for both Irkutsk State University and the East Siberian branch of the All-Russian Scientific Research Institute for Physical-Engineering and Radiotechnical Metrology.

Arktur's wife, Kira Sergeevna Mansurova, was a notable astronomer as well; she worked at the ISU observatory starting in 1957 and served as its director between 1972 and 1988.