John Albert Nejedly (October 22, 1914 – September 19, 2006) was a district attorney and Republican state senator in California who represented Contra Costa County from 1958 to 1980.

While serving as City Attorney, he played a key role in the creation of the Little Master Plan, a land use and public improvement plan that called for the culverting of portions of Walnut, Las Trampas, and San Ramon Creeks within downtown Walnut Creek, for the purpose of flood control and commercial development.

A plaque commemorating the Little Master Plan can be found at the corner of Duncan Street and North Broadway, in downtown Walnut Creek.

Ultimately he was a leader with local attorney Hulet Hornbeck in the successful 1964 campaign to expand the East Bay Regional Park District to include much of the County.

It was also during this time that Nejedly donated 80 acres (32 ha) of wilderness land at Hawley Lake in the Sierra Nevadas for use as a summer camp by Boy Scouts of the Mt.

After his retirement from the state senate in 1980, Nejedly was active in many community organizations related to the environment, water policy, criminal justice, healthcare, and children's welfare.

In October 2005 a trail leading from the staging area was named in honor of Hulet Hornbeck, Nejedly's good friend and collaborator in helping to extend the East Bay Regional Park District into Contra Costa County.