I don't label myself Baptist; but I substantially agree with their theology. There are several denominations, who, like the Baptists, follow a body of teaching which, as VW points out, has been practiced since before the mid second century.
The teachings of Jan Hus, Menno Simons, and the Waldensians, span four centuries before the reformation; and substantially agree with each other and with the earlier teachings which VW mentioned.
Several denominations, beside the Baptists, came out of the same movement; and are very similar if not doctrinally identical with the Baptists.
They are:
The Mennonites, the Plymouth Brethren, the Christian Church, the Evangelical Free Church, the Christian Missionary Alliance, the Mission Covenant Church, Calvary Chapel, and In Faith. I am sure there are others which I am unfamiliar with.
In addition, except for differences in church polity, the Free Methodists are also very similar doctrinally.
Many non- denominational churches also have similar doctrine.