Dreger Clock, Historic clock in Buena Park, United States.

The Dreger Clock is a large freestanding town clock with three display faces carrying 19 dials: local California time, the time in 12 cities from New York and Liverpool to Tokyo and Mexico City, the moon's phase, the date and the weekday. Andrew Dreger Sr. built it from 1928 to 1933; it stands on a new post facing Beach Boulevard (SR 39).

Andrew Dreger Sr., a German immigrant and watchmaker, constructed this timepiece between 1928 and 1933 originally for his Long Beach residence. The work was later relocated to Buena Park, where it now stands near the Whitaker-Jaynes house.

The clock's international dials were originally set to solar time, so the minute hands of the twelve city clocks did not agree; this was changed to standard time zones when it moved to Knott's Berry Farm in 1952-53. The dedication of the restored clock took place on Saturday, October 3, 2009, a week after installation.

The clock stands in the Buena Park Historical District, in front of the Whitaker-Jaynes house and facing Beach Boulevard (SR 39), not near City Hall. It is an outdoor installation viewed from the street and sidewalk, so it can be seen at any hour. The original cracked date-and-moon face is kept indoors at the Whitaker-Jaynes house, which serves as the city's history museum.

The device is powered by a 110-volt electric motor connected through bicycle chain drives to the international time displays. This unusual drive system using different mechanical elements allows all hands to move simultaneously.