Singles
1981 Tokyo Indoor
Final
Champion	Vincent Van Patten
Runner-up	Mark Edmondson
Score	6–2, 3–6, 6–3
Details
Draw	32
Seeds	8
Events
Singles Doubles
← 1980 · Tokyo Indoor · 1982 →

Jimmy Connors was the defending champion, but did not participate this year.

Unseeded Vincent Van Patten won the tournament, beating Mark Edmondson in the final, 6–2, 3–6, 6–3.

	Semifinals							Final
	1	John McEnroe	3	5
		Vincent Van Patten	6	7
									Vincent Van Patten	6	3	6
									Mark Edmondson	2	6	3
		Mark Edmondson	77	6
		Heinz Günthardt	64	4

	First round							Second round							Quarterfinals							Semifinals
	1	J McEnroe	6	6
		J Sadri	2	2				1	J McEnroe	6	6
		T Fukui	6	6					T Fukui	3	2
		S Shiraishi	4	2											1	J McEnroe	6	6
		B Scanlon	6	6												B Scanlon	4	3
		R Cano	1	4					B Scanlon	6	4	6
		D Gitlin	2	77	5			LL	C Dunk	2	6	1
	LL	C Dunk	6	63	7																	1	J McEnroe	3	5
	3	J-L Clerc	6	6																			V Van Patten	6	7
		P McNamee	2	4				3	J-L Clerc	77	5	65
		V Van Patten	6	6					V Van Patten	64	7	77
		J Fitzgerald	2	4												V Van Patten	0	6	6
		C Lewis	6	7											5	V Gerulaitis	6	3	3
		T Moor	4	5					C Lewis	2	3
		J Bailey	4	7	1			5	V Gerulaitis	6	6
	5	V Gerulaitis	6	5	6

	First round							Second round							Quarterfinals							Semifinals
	6	W Fibak	77	3	6
		M Purcell	63	6	3			6	W Fibak	6	6
		V Amaya	3	6	67				P Dent	4	3
		P Dent	6	2	79										6	W Fibak	5	2
		To Gullikson	4	7	1											M Edmondson	7	6
		M Edmondson	6	5	6				M Edmondson	66	6	6
		B Manson	6	6					B Manson	78	4	4
	4	E Teltscher	3	3																			M Edmondson	77	6
	8	B Taróczy	6	3	4																		H Günthardt	64	4
		H Günthardt	4	6	6				H Günthardt	7	6
		R Frawley	6	3	4				P Rennert	5	3
		P Rennert	4	6	6											H Günthardt	77	77
		E Takeuchi	1	2												Ti Gullikson	63	62
		Ti Gullikson	6	6					Ti Gullikson	6	6
		R Krishnan	3	6	2			2	B Borg	3	1
	2	B Borg	6	4	6

• Main draw