February 25 – The prewar U.S. 18-channel VHF allocation is officially ended in favor of a new 13-channel VHF allocation due to the appropriation of some frequencies by the military and the relocation of FM radio. Only five of the old channels are the same as new channels in terms of frequency and none have the same number as before.
April 22 – CBS transmits a Technicolor movie short and color slides by coaxial cable from Manhattan to Washington (332 kilometers) and return.
June 19 – The first televised heavyweight boxing title fight between Joe Louis and Billy Conn is broadcast from Yankee Stadium. The fight is seen by 141,000 people, the largest television audience to see a boxing match to this date.
July 7 – Broadcasting of the BBC's children's programme For The Children is resumed, one of the few pre-war programmes to resume after reintroduction of the service.
August 4 – Children's puppet "Muffin the Mule" debuts in an episode of the series For the Children. He is so popular he is given his own show later that same year.
October 22 – Telecrime, the first television crime series from the 1930s, is resumed by the BBC, retitled Telecrimes.
December 24 – The first church service is telecast, Grace Episcopal Church in New York, on WABD.
Tokyo Tsushin Kogyo founds a company, which would later become Sony.
Zoomar introduces the first professional zoom lens for television cameras.
In the United States, only DuMont and NBC are broadcasting evenings during 1946. DuMont broadcasts a Western movie on Sunday night for an hour, other programming for an hour on Tuesday, and half hours on Wednesday and Thursday nights. NBC broadcasts an hour of programming on Sunday, two hours on Thursday, and the Gillette Cavalcade of Sports on Monday and Friday nights, with an additional hour on Fridays.
The first postwar television sets are released by the companies RCA, DuMont, Crosley, and Belmont.