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| Set | Card | | Card Description | |
| 1975 Topps | 615 | | Rookie Pitchers Darcy, Pat (Philadelphia Phillies) Leonard, Dennis (Philadelphia Phillies) RC Underwood, Tom (Philadelphia Phillies) Webb, Hank (Philadelphia Phillies) |
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| 1976 Topps | 334 | | Leonard, Dennis (Kansas City Royals) |
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| 1977 Topps | 75 | | Leonard, Dennis (Kansas City Royals) |
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| 1978 Topps | 205 | | Victory Leaders Carlton, Steve (Philadelphia Phillies) LL Goltz, Dave (Minnesota Twins) LL Leonard, Dennis (Kansas City Royals) LL Palmer, Jim (Baltimore Orioles) LL |
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| 1978 Topps | 665 | | Leonard, Dennis (Kansas City Royals) |
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| 1979 Topps | 218 | | Leonard, Dennis (Kansas City Royals) |
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| 1979 Topps | 418 | | D.Leonard/W.Johnson ATL Johnson, Walter ATL Leonard, Dennis (Kansas City Royals) ATL |
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| 1980 Topps | 565 | | Leonard, Dennis (Kansas City Royals) |
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| 1981 Fleer | 42 | | Leonard, Dennis (Kansas City Royals) |
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| 1981 Donruss | 102 | | Leonard, Dennis (Kansas City Royals) |
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| 1981 Topps | 185 | | Leonard, Dennis (Kansas City Royals) |
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| 1982 Donruss | 264 | | Leonard, Dennis (Kansas City Royals) |
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| 1982 Fleer | 413 | | Leonard, Dennis (Kansas City Royals) |
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| 1982 Topps | 495 | | Leonard, Dennis (Kansas City Royals) |
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| 1983 Fleer | 116 | | Leonard, Dennis (Kansas City Royals) |
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| 1983 Donruss | 412 | | Leonard, Dennis (Kansas City Royals) |
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| 1983 Topps | 785 | | Leonard, Dennis (Kansas City Royals) |
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| 1984 Fleer | 349 | | Leonard, Dennis (Kansas City Royals) |
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| 1984 Topps | 375 | | Leonard, Dennis (Kansas City Royals) |
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| 1986 Topps Traded | 65 | T | Leonard, Dennis (Kansas City Royals) |
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