Sir Percy Malcolm Stewart, 1st Baronet (9 May 1872 – 27 February 1951), was an English industrialist and philanthropist.

He became chairman of the board of the Associated Portland Cement Manufacturers Ltd (APCM) in 1924 and remained in that position until 1945 when he became company president.

As a special commissioner appointed by Ramsay MacDonald's coalition government of 1934, he helped devise schemes to reduce unemployment.

In 1934, Sir Malcolm bought The Lodge at Sandy, Bedfordshire[1] which is currently the headquarters of the RSPB.

[3] He died in February 1951, aged 78, and was succeeded in the baronetcy by his son Ronald.