The Theo Marks Stakes is a Group 2 race run under Quality Handicap conditions for open class horses usually at Rosehill conducted by the Australian Turf Club.

The Theo Marks Stakes is run over 1300m. It was first run in 1946 and was won by the champion Shannon.

The Theo Marks Stakes has been run over 1300m or 1400m. The 1991 running was at Canterbury and in 2021 when it was forced to be moved to Kembla Grange due to geographic coronavirus protocols.

The Theo Marks Stakes has been a Group 2 since moving out of Principal Race system in 1979.

The only horses to carry the maximum 60kg since the metric system came in have been Racing To Win (2009) and Shogun Lodge (2001) – it's now 61kg max.

In the last 20 years only Kiku, Winx, More Joyous, Hurried Choice and Arcadia Queen have been mare winners.

The 2007 race was not held due to the Equine Influenza break out.

The Theo Marks Stakes was worth $300,000 in 2023.

The winner is exempt from ballot for the Epsom Handicap.

When Deploy won with ease, it secured him a slot in the Everest five weeks later in 2017.

Chris Waller has won 5 of the last 11 editions.

Winx's victory in 2015 was her first in Sydney as part of her incredible streak.

Golden Mile won this in 2023. He had also won the Ming Dynasty on this day the previous year, his father Astern won the Run To The Rose on this day and his grandfather Lonhro won the Ming Dynasty as well.

Notable winners of the Theo Marks Stakes include Golden Mile (2023), Arcadia Queen (2019), Winx (2015), More Joyous (2010), Racing To Win (2006/2009), Paratroopers (2005), Defier (2002), Shogun Lodge (2001), Adam (1999), Catalan Opening (1997), Ivory's Irish (1995), Joanne (1991), Groucho (1987), Inspired (1984), Scomeld (1979), Cabochon (1967), Time And Tide (1963/1965/1966), Martello Towers (1961) and Shannon (1946).

The 2023 Theo Marks Stakes was won by Golden Mile from The Inevitable and Waterford.