Thomas Belasyse, 1st Earl Fauconberg PC (c. 1627 – 31 December 1700) was an English peer.

After the Restoration of the monarchy he became a member of the Privy Council to Charles II and was elevated to an earldom by William III.

[2] Unlike his Royalist father and grandfather, Belasyse supported Parliament in the English Civil War, and subsequently became a strong adherent of Oliver Cromwell, whose third daughter, Mary, he married in 1657.

He had no children; on his death, the earldom became extinct, but his viscountcy passed to his nephew, Thomas Belasyse, 3rd Viscount Fauconberg.

On 3 July 1651 Fauconberg married Mildred, daughter of Nicholas Saunderson, 2nd Viscount Castleton.