May Jacks was a British tennis player at the end of the nineteenth century.

In 1887 she played at the Essex Championships where she reached the final where she lost in straight sets to Brenda James.

Her other career singles highlights include winning the Kent Championships in 1888 and 1890.

The same year she was a finalist at the South of England Championships where she lost to May Langrishe.

In 1890 Jacks retained the title at the inaugural London Championships when it had moved to the Queen's Club, beating Maud Shackle 6–2, 6–1.