Florin Mergea was the defending champion, but did not complete in the Juniors this year.

Gaël Monfils defeated Miles Kasiri in the final, 7–5, 7–6^(8-6) to win the boys' singles tennis title at the 2004 Wimbledon Championships.^[1]

Click on the seed number of a player to go to their draw section.

	Quarterfinals							Semifinals							Final
	1	Gaël Monfils	7	6
	7	Brendan Evans	5	2
								1	Gaël Monfils	6	6
								Q	Jérémy Chardy	4	2
		Jamie Baker	4	64
	Q	Jérémy Chardy	6	77
															1	Gaël Monfils	7	78
																Miles Kasiri	5	66
		William Ward	4	3
		Miles Kasiri	6	6
									Miles Kasiri	77	77
								11	Scoville Jenkins	65	63
	11	Scoville Jenkins	6	6
		Jun Woong-sun	3	3

	First round							Second round							Third round							Quarterfinals
	1	Gaël Monfils	77	6
		Tom Rushby	62	4				1	G Monfils	4	77	6
		Phillip Simmonds	65	67					M Ziadi	6	62	2
		Mehdi Ziadi	77	79											1	G Monfils	6	6
	WC	Jack Baker	2	3											16	R de Rijke	2	4
	Q	Juho Paukku	6	6				Q	J Paukku	4	3
	Q	Greg Ouellette	6	3	4			16	R de Rijke	6	6
	16	Remko de Rijke	3	6	6																	1	G Monfils	7	6
	12	Karan Rastogi	4	4																		7	B Evans	5	2
		G.D. Jones	6	6					G.D. Jones	7	3	6
		Guillermo Alcaide	3						G Alcaide	5	6	4
		Aljoscha Thron	1r													G.D. Jones	2	1
		Juan-Pablo Amado	6	3	6										7	B Evans	6	6
	WC	Faris Khatib	1	6	1				J-P Amado	4	4
		Andrea Arnaboldi	2	0				7	B Evans	6	6
	7	Brendan Evans	6	6

	First round							Second round							Third round							Quarterfinals
	4	Kamil Čapkovič	6	6
		Thomaz Bellucci	3	2				4	K Čapkovič	4	6	8
	Q	Kevin Anderson	6	3	6			Q	Kevin Anderson	6	3	6
		Joel Kerley	4	6	1										4	K Čapkovič	3	4
		Jamie Baker	6	6												J Baker	6	6
	WC	Michael Leong	2	0					J Baker	6	77
		Sergei Bubka	7	4	6				Sergei Bubka	1	61
	14	Scott Oudsema	5	6	0																		J Baker	4	64
	10	Kim Sun-yong	1	5																		Q	J Chardy	6	77
	Q	Jérémy Chardy	6	7				Q	J Chardy	6	6
	WC	Matthew Brown	2	4					Vilim Višak	1	4
		Vilim Višak	6	6											Q	J Chardy	6	2	6
	WC	Donald Young	3	6	6										8	S Rieschick	2	6	2
		Robin Haase	6	2	1			WC	Donald Young	2	4
		Jamie Murray	4	6	1			8	S Rieschick	6	6
	8	Sebastian Rieschick	6	4	6

	First round							Second round							Third round							Quarterfinals
	5	Alex Kuznetsov	6	77
		Daniel Müller	2	64				5	A Kuznetsov	4	65
	WC	Niels Desein	6	6				WC	N Desein	6	77
	WC	Richard Wire	3	2											WC	N Desein	6	3	2
		Lukáš Lacko	77	3	4											W Ward	3	6	6
	Q	Roman Herold	65	6	6			Q	R Herold	4	5
		William Ward	2	6	6				W Ward	6	7
	9	Pablo Andújar	6	2	4																		W Ward	4	3
	15	Coen van Keulen	4	4																			M Kasiri	6	6
		Timothy Neilly	6	6					T Neilly	5	1
		Rafael Arévalo	0	617					M Kasiri	7	6
		Miles Kasiri	6	719												M Kasiri	6	5	7
		Yi Chu-huan	6	3	6										3	J Ouanna	3	7	5
		Divij Sharan	1	6	1				C-h Yi	61	3
		Lachlan Ferguson	64	2				3	J Ouanna	77	6
	3	Josselin Ouanna	77	6

	First round							Second round							Third round							Quarterfinals
	6	Mischa Zverev	6	6
	LL	Philipp Oswald	3	4				6	M Zverev	6	2	3
	Q	Takanobu Fujii	1	4				Q	M Fischer	1	6	6
	Q	Martin Fischer	6	6											Q	M Fischer	65	3
		Juan Martín del Potro	6	78											11	S Jenkins	77	6
	WC	Nick Cavaday	4	66					JM del Potro	3	4
		Peter Miklušičák	3	3				11	S Jenkins	6	6
	11	Scoville Jenkins	6	6																		11	S Jenkins	6	6
	13	Fabio Fognini	2	3																			W-s Jun	3	3
		Jun Woong-sun	6	6					W-s Jun	77	6
		Viktor Troicki	65	77	6				V Troicki	63	3
		Tushar Liberhan	77	62	1											W-s Jun	7	6
		Alexander Nedovesov	6	6											2	A Murray	5	3
		Vahid Mirzadeh	3	4					A Nedovesov	2	2
	Q	Nikita Kryvonos	6	4	2			2	A Murray	6	6
	2	Andy Murray	3	6	6

• Source for the draw at Wimbledon.com
• "The Junior Championships, Wimbledon 2004". International Tennis Federation. Retrieved 28 May 2018.