The Burying in Woollen Acts 1666–80 were Acts of the Parliament of England (citation 18 & 19 Cha. 2. c. 4 (1666),^[1][2] 30 Cha. 2. c. 3 (1678)^[3] and 32 Cha. 2. c. 1 (1680)^[4]) which required the dead, except plague victims and the destitute, to be buried in pure English woollen shrouds to the exclusion of any foreign textiles.^[5]

It was a requirement that an affidavit be sworn in front of a justice of the peace (usually by a relative of the deceased), confirming burial in wool, with the punishment of a £5 fee for noncompliance. Burial entries in parish registers were marked with the word "affidavit" or its equivalent to confirm that affidavit had been sworn; it would be marked "naked" for those too poor to afford the woollen shroud.

The legislation was in force until 1814, but was generally ignored after 1770.^[6] The 1666 Act was repealed by the Statute Law Revision Act 1863.^[7]

Burial records so annotated can be a source of genealogical information, providing evidence of economic status and relationships that may be otherwise unavailable or ambiguous.^[8][9]