WGBX-TV (channel 44), branded GBH 44, is the secondary PBS member television station in Boston, Massachusetts, United States. It is owned by the WGBH Educational Foundation alongside WGBH-TV (channel 2) and originates from studios on Guest Street in northwest Boston's Brighton neighborhood. WGBX-TV's transmitter is located on Cedar Street (southwest of I-95/MA 128) in Needham, Massachusetts.

WGBX-TV began broadcasting in September 1967 as a source of experimental, alternative, and additional educational programming, in addition to repeats of shows aired by WGBH-TV. It also provided an outlet for specialty telecourses and instructional material. In the 1960s and 1970s, such programs as The Most Dangerous Game, Catch 44, and Club 44 attracted national attention or moved to the parent station. WGBX-TV provided the first gavel-to-gavel telecast of an American state legislature in 1984 when the Massachusetts House of Representatives agreed to have their sessions televised in full, and it was a test bed for experimentation with new digital audio standards in the late 1980s. In the 1990s, WGBX-TV programming was revamped to feature themed nights and increase awareness of its identity.

WGBX-TV itself broadcasts standard-definition versions of WGBX and WGBH (both in high definition from the WGBH-TV multiplex) and several multicast services. WBTS-CD, NBC10 Boston, shares the channel, allowing the station to broadcast at high power to the Boston area.

Channel 44 had originally been allotted to Boston as a commercial television channel. Two companies, Integrated Communications Systems and United Artists Broadcasting, had each applied for the channel in 1963. They were soon joined by the WGBH Educational Foundation, which proposed a non-commercial educational station. All three applications were designated for comparative hearing in February 1964, but that July, the FCC reserved channel 44 for educational use in Boston and transferred channel 25 from Barnstable to serve as a new commercial channel. The two commercial applicants then switched their proposals to channel 25, leaving WGBH alone in its channel 44 application and allowing the Federal Communications Commission (FCC) to award the construction permit in October.

The Department of Health, Education and Welfare awarded a $725,000 grant for the construction of WGBX-TV in January 1966; the station was projected to provide specialized educational programming. WGBX-TV began broadcasting on September 25, 1967, two weeks after the station aired its first test pattern.

In addition to replays and additional PBS programs as well as college telecourses, WGBX has offered a wide range of experimental programs and services in its history. The very first program broadcast by the station was a teacher in-service program designed to help first-grade instructors teach drama. On The Most Dangerous Game, an audience participation program telecast in 1967, viewers could call a telephone number to control the movement of a fictional country, Transania, in a hypothetical foreign policy crisis. A monthly series on the intersection of law enforcement and critical justice was distributed to other educational stations. In 1968, WGBX-TV and WBZ-TV broadcast Read Your Way Up: A TV Read-In, an adult literacy program. In November 1970, the station debuted a public-access show, Catch 44. The program attracted widespread national and international interest; other public stations copied the format, as did the BBC, which launched Open Door in 1973. In 1973, as part of an initiative by the WGBH Educational Foundation, it and nine other public stations in northeastern cities began airing an open-captioned version of the ABC Evening News.

WGBX began airing live, gavel-to-gavel (beginning to end) coverage of the Massachusetts House of Representatives in 1984, making it the first state legislative chamber to have full, unedited proceedings televised. The Massachusetts State Senate joined the House on WGBX in 1994. Legislative coverage on channel 44 continued through 2006; the contracts with each chamber were not renewed for 2007.

Beginning in 1986 and continuing through at least 1988, with special FCC permission, it was the only station in the United States authorized to broadcast pulse-code modulation (PCM) digital audio on its video signal; the audio programs, primarily simulcasts of WGBH-FM aired overnight but also including specially recorded concerts, could then be decoded from the video tape by residents with the appropriate decoder equipment.