Men's 200 metre butterfly at the I959 Pan American Games
Venue	-
Dates	September 3 (preliminaries), September 4 (finals)
Medalists
Dave Gillanders   United States   Michael Troy   United States   Eulalio Ríos   Mexico
«1955 1963»

The men's 200 metre butterfly competition of the swimming events at the 1959 Pan American Games took place on 3 September (preliminaries)^[1][2] and 4 September (finals).^[3] The last Pan American Games champion was Eulalio Ríos of Mexico.^{[4][5][6][7][8]}

This race consisted of four lengths of the pool, all lengths being in butterfly stroke.^[9]

All times are in minutes and seconds.

The first round was held on September 3.^[1]

Rank	Heat	Name	Nationality	Time	Notes
1	2	Dave Gillanders	United States	2:20.2	Q, GR
2	1	Michael Troy	United States	2:20.5	Q
3	3	Tony Tashnick	United States	2:22.0	Q
4	1	Eulalio Ríos	Mexico	2:22.5	Q
5	2	Fernando Fanjul	Argentina	2:26.4	Q
6	1	Peter Fowler	Canada	2:38.8	Q
7	2	Heriberto Alvarado	Chile	2:41.3	Q
8	2	Ernesto Muñoz	Mexico	2:41.6	Q
-	3	Moacir dos Santos	Brazil	2:49.8

The final was held on September 4.^[3]

Rank	Name	Nationality	Time	Notes
	Dave Gillanders	United States	2:18.0	GR
	Michael Troy	United States	2:18.3
	Eulalio Ríos	Mexico	2:22.5
4	Tony Tashnick	United States	2:22.8
5	Fernando Fanjul	Argentina	2:29.3
6	Ernesto Muñoz	Mexico	2:39.5
7	-	-	-
8	-	-	-