This logo looks similar to the BBC2 logo from 1967, minus the dot.
Since its first use in 1975, this logo has been affectionately known as "Circle Laser 2"; the nickname is derived from the "Laser II" spaceship featured on Captain Satellite, KTVU's afternoon children's program that ran in the 1960s.
The original version of the "Circle Laser 2" logo introduced in 1975 had the design of the "2" design formatted in a more distant perspective. It was phased out with the introduction of the next logo in April 1997 as a general-use logomark, although its early morning newscast Mornings on 2 continued to use the 1975 version for its opening and closing sequences until March 2001.
On October 9, 1986, KTVU along with Cox's other two independent stations WKBD in Detroit and KDNL-TV in St. Louis officially joined Fox as one of the network’s charter affiliates. The "Circle Laser 2" continued to be used as the station's logo long after KTVU affiliated with Fox, and it began to be accompanied by the 1987 Fox logo for use in prime-time programming promotions in 1990. The indigo variant of the station's logo was used initially until September 1992, when it was changed to entirely yellow, with both versions used in tandem until 1993. This version and the one that followed were only used during Fox network promotions, mainly those airing during local commercial breaks on the station.
After Fox tightened branding standardization for its affiliates, KTVU obliged by amending its on-air branding to "Fox Channel 2" (though it sometimes continued to be referenced as simply "Channel 2") in September 1996. The alternate logo used in station-amended promotions for Fox network programs and promos for other entertainment programming seen on KTVU was consequently updated to incorporate the 1996 searchlight-and-wordmark-only version of the Fox logo.
KTVU modified its branding in April 1997, shortening its on-air moniker to "KTVU Fox 2" and inserting the Fox wordmark to the "Circle Laser 2" logo. The abbreviated "Fox 2" brand was used obliquely in promotions for KTVU's news programming, with the station employing KTVU Channel 2 News or similar variations on a formal basis. It continued to be in use after Fox Television Stations traded WFXT and WHBQ-TV to Cox Media Group for KTVU and KICU until February 2, 2015.
After its 2014 acquisition by Fox Television Stations, the Fox portion of KTVU's branding gained more prominence by January 9, 2015, with the network logo appearing side-by-side with KTVU's longtime "Circle Laser 2." However, the previous logo continued to be used until the next logo debuted. Despite being no longer used as a secondary logo, this logo is still used as a screenbug.
In January 2015, KTVU also integrated the "Circle Laser 2" logo into the Fox News Channel-inspired Fox O&O logo as part of its adoption of the branding standardization of new owner Fox Television Stations, which acquired KTVU and KICU the previous year, through a trade deal with WHBQ-TV in Memphis and WFXT in Boston with former longtime owner Cox Media Group. This logo branding, currently in use by most of the Fox O&Os, is based on the Fox News logo; with their website names ("myfox(city name).com") based on the domain for the social network Myspace, which former Fox parent News Corporation briefly owned. This logo is no longer in use since KTVU de-emphasized the use of standardized graphics since then.
Same as before, but with the callsign added underneath the Fox wordmark on April 30, 2017.
The Fox wordmark received a slight tweak after KTVU introduced its new graphics package (designed by the Graphics Hub division of Fox Television Stations, which first appeared on sister stations KSAZ-TV in Phoenix and WTVT in Tampa–St. Petersburg in December 2019) on January 22, 2020.