There are five Twilight movies in total, and they can be watched in either release order or chronological order. Here are the movies in both orders:

Release Order:

1. Twilight (2008)
2. The Twilight Saga: New Moon (2009)
3. The Twilight Saga: Eclipse (2010)
4. The Twilight Saga: Breaking Dawn - Part 1 (2011)
5. The Twilight Saga: Breaking Dawn - Part 2 (2012)

Chronological Order:

1. Twilight (2008)
2. The Twilight Saga: New Moon (2009)
3. The Twilight Saga: Eclipse (2010)
4. The Twilight Saga: Breaking Dawn - Part 1 (2011)
5. The Twilight Saga: Breaking Dawn - Part 2 (2012)

All of the search results agree on the order of the movies, with some providing additional information about the plot and characters.