Forty-five may refer to:
The 45 refers to the Jacobite rising of 1745 in Great Britain, or the year that World War II ended, which was 1945.
A card game: Forty-five
.45 (film), a 2006 motion picture.
+45 is the telephone calling code for Denmark
A football match consists of two periods of 45 minutes each.
I-45 is the designation for a US interstate highway in Texas, connecting the major cities of Dallas and Houston.
The number of the French department Loiret
The maximum mark an International Baccalaureate student can obtain.
In years of marriage, the sapphire wedding anniversary.
The number of the laps of the German Grand Prix from 1978 until 2001. (except 1985 because the race was held at Nürburgring).
The number of milligrams of Prednisolone that "mamici1" is taking, as of today!
Woo Hooo! Down another 5!