- Cameron Club Collection (MS077), 1895/194425
- Captain Rufus D. Pettit Papers (MS093), 1863/186518
- Cazenove Family Papers (MS212), 1786/1970250
- Cazenove and Co. Ledger (MS293), 1857/18615
- Chapman Family Collection (MS274), 1828/196311
- Chapman-Southerland Collection (MS409), 1878/19136
- Charles L. Sampson Collection (MS126), 1841/198678
- Christ Church Records (MS306), 1873/19451
- Civitan and Civinette Clubs of Alexandria Collection (MS038), 1942/197813
- Curtin Family Papers (MS101), 1885/200018