Doubles
2021 Heilbronner Neckarcup
Final
Champions	Nathaniel Lammons Jackson Withrow
Runners-up	André Göransson Sem Verbeek
Score	6–7(4–7), 6–4, [10–8]
Events
Singles Doubles
← 2019 · Heilbronner Neckarcup · 2022 →

Kevin Krawietz and Andreas Mies were the defending champions^[1] but chose not to defend their title.

Nathaniel Lammons and Jackson Withrow won the title after defeating André Göransson and Sem Verbeek 6–7^(4–7), 6–4, [10–8] in the final.

	First round							Quarterfinals							Semifinals							Final
								1	A-u-H Qureshi A Vasilevski	77	6
		L Glasspool M Reid	3	6	[10]				L Glasspool M Reid	61	4
		LD Martínez D Vega Hernández	6	4	[8]										1	A-u-H Qureshi A Vasilevski	4	4
	4	R Matos F Meligeni Alves	6	6												A Göransson S Verbeek	6	6
		I Sabanov M Sabanov	3	0				4	R Matos F Meligeni Alves	4	65
		D Masur D Molchanov	62	63					A Göransson S Verbeek	6	77
		A Göransson S Verbeek	77	77																			A Göransson S Verbeek	77	4	[8]
	WC	T Altuna A Çelikbilek	4	4																		3	N Lammons J Withrow	64	6	[10]
		D Kudla M McDonald	6	6					D Kudla M McDonald	64	2
		DE Galán T Griekspoor						3	N Lammons J Withrow	77	6
	3	N Lammons J Withrow	w/o												3	N Lammons J Withrow	6	6
		M Polmans A Sitak	6	6											2	S Arends D Sharan	3	3
	WC	A Begemann D Brown	4	4					M Polmans A Sitak	2	6	[8]
		T Daniel B Zapata Miralles	2	5				2	S Arends D Sharan	6	3	[10]
	2	S Arends D Sharan	6	7

• Main draw