Sir Nicholas Steward, 1st Baronet FRS (11 February 1618 – 15 February 1710) of Pylewell Park, Hampshire was an English MP and Chamberlain of the Exchequer.

[2] He was born the eldest son of Simeon Steward of Hartley Mauditt, Hampshire and studied law at Lincoln's Inn.

After the Restoration of the Monarchy in 1660 he was created Baronet Steward of Hartley Mauditt and given the sinecure position of Chamberlain of the Exchequer until his death in 1710.

He was elected Member of Parliament for Lymington in a by-election in 1663, sitting until 1679.

He died in 1710 and was buried in the churchyard of St Leonard's Church, Worldham.